feat(auth): add OAuth2 support for xAI with PKCE and token persistence

- Implemented xAI OAuth2 integration with PKCE (Proof Key for Code Exchange) support.
- Added logic for token exchange, refresh, and persistent storage in JSON format.
- Created `xai` package with helpers for OAuth discovery, API token handling, and URL building.
- Introduced `XAIExecutor` for integrating xAI credentials into runtime HTTP requests.
- Added unit tests to validate OAuth flow, token persistence, and endpoint validation.

internal/api/handlers/management/auth_files.go

@@ -27,6 +27,7 @@ import (
 	"github.com/router-for-me/CLIProxyAPI/v7/internal/auth/codex"
 	geminiAuth "github.com/router-for-me/CLIProxyAPI/v7/internal/auth/gemini"
 	"github.com/router-for-me/CLIProxyAPI/v7/internal/auth/kimi"
+	xaiauth "github.com/router-for-me/CLIProxyAPI/v7/internal/auth/xai"
 	"github.com/router-for-me/CLIProxyAPI/v7/internal/interfaces"
 	"github.com/router-for-me/CLIProxyAPI/v7/internal/misc"
 	"github.com/router-for-me/CLIProxyAPI/v7/internal/registry"
@@ -2132,6 +2133,185 @@ func (h *Handler) RequestAntigravityToken(c *gin.Context) {
 	c.JSON(200, gin.H{"status": "ok", "url": authURL, "state": state})
 }
 
+func (h *Handler) RequestXAIToken(c *gin.Context) {
+	ctx := context.Background()
+	ctx = PopulateAuthContext(ctx, c)
+
+	fmt.Println("Initializing xAI authentication...")
+
+	pkceCodes, errPKCE := xaiauth.GeneratePKCECodes()
+	if errPKCE != nil {
+		log.Errorf("Failed to generate xAI PKCE codes: %v", errPKCE)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to generate PKCE codes"})
+		return
+	}
+
+	state, errState := misc.GenerateRandomState()
+	if errState != nil {
+		log.Errorf("Failed to generate state parameter: %v", errState)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to generate state parameter"})
+		return
+	}
+
+	nonce, errNonce := misc.GenerateRandomState()
+	if errNonce != nil {
+		log.Errorf("Failed to generate nonce parameter: %v", errNonce)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to generate nonce parameter"})
+		return
+	}
+
+	authSvc := xaiauth.NewXAIAuth(h.cfg)
+	discovery, errDiscover := authSvc.Discover(ctx)
+	if errDiscover != nil {
+		log.Errorf("Failed to discover xAI OAuth endpoints: %v", errDiscover)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to discover oauth endpoints"})
+		return
+	}
+
+	redirectURI := fmt.Sprintf("http://%s:%d%s", xaiauth.RedirectHost, xaiauth.CallbackPort, xaiauth.RedirectPath)
+	authURL, errAuthURL := xaiauth.BuildAuthorizeURL(xaiauth.AuthorizeURLParams{
+		AuthorizationEndpoint: discovery.AuthorizationEndpoint,
+		RedirectURI:           redirectURI,
+		CodeChallenge:         pkceCodes.CodeChallenge,
+		State:                 state,
+		Nonce:                 nonce,
+	})
+	if errAuthURL != nil {
+		log.Errorf("Failed to generate xAI authorization URL: %v", errAuthURL)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to generate authorization url"})
+		return
+	}
+
+	RegisterOAuthSession(state, "xai")
+
+	isWebUI := isWebUIRequest(c)
+	var forwarder *callbackForwarder
+	if isWebUI {
+		targetURL, errTarget := h.managementCallbackURL("/xai/callback")
+		if errTarget != nil {
+			log.WithError(errTarget).Error("failed to compute xai callback target")
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "callback server unavailable"})
+			return
+		}
+		var errStart error
+		if forwarder, errStart = startCallbackForwarder(xaiauth.CallbackPort, "xai", targetURL); errStart != nil {
+			log.WithError(errStart).Error("failed to start xai callback forwarder")
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to start callback server"})
+			return
+		}
+	}
+
+	go func() {
+		if isWebUI {
+			defer stopCallbackForwarderInstance(xaiauth.CallbackPort, forwarder)
+		}
+
+		waitFile := filepath.Join(h.cfg.AuthDir, fmt.Sprintf(".oauth-xai-%s.oauth", state))
+		deadline := time.Now().Add(5 * time.Minute)
+		var authCode string
+		for {
+			if !IsOAuthSessionPending(state, "xai") {
+				return
+			}
+			if time.Now().After(deadline) {
+				log.Error("xai oauth flow timed out")
+				SetOAuthSessionError(state, "OAuth flow timed out")
+				return
+			}
+			if data, errReadFile := os.ReadFile(waitFile); errReadFile == nil {
+				var payload map[string]string
+				_ = json.Unmarshal(data, &payload)
+				_ = os.Remove(waitFile)
+				if errStr := strings.TrimSpace(payload["error"]); errStr != "" {
+					log.Errorf("xAI authentication failed: %s", errStr)
+					SetOAuthSessionError(state, "Authentication failed: "+errStr)
+					return
+				}
+				if payloadState := strings.TrimSpace(payload["state"]); payloadState != "" && payloadState != state {
+					log.Errorf("xAI authentication failed: state mismatch")
+					SetOAuthSessionError(state, "Authentication failed: state mismatch")
+					return
+				}
+				authCode = strings.TrimSpace(payload["code"])
+				if authCode == "" {
+					log.Error("xAI authentication failed: code not found")
+					SetOAuthSessionError(state, "Authentication failed: code not found")
+					return
+				}
+				break
+			}
+			time.Sleep(500 * time.Millisecond)
+		}
+
+		bundle, errExchange := authSvc.ExchangeCodeForTokens(ctx, authCode, redirectURI, pkceCodes, discovery.TokenEndpoint)
+		if errExchange != nil {
+			log.Errorf("Failed to exchange xAI token: %v", errExchange)
+			SetOAuthSessionError(state, oauthSessionErrorWithCause("Failed to exchange authorization code for tokens", errExchange))
+			return
+		}
+
+		tokenStorage := authSvc.CreateTokenStorage(bundle)
+		if tokenStorage == nil || strings.TrimSpace(tokenStorage.AccessToken) == "" {
+			log.Error("xAI token exchange returned empty access token")
+			SetOAuthSessionError(state, "Failed to exchange token")
+			return
+		}
+
+		fileName := xaiauth.CredentialFileName(tokenStorage.Email, tokenStorage.Subject)
+		label := strings.TrimSpace(tokenStorage.Email)
+		if label == "" {
+			label = "xAI"
+		}
+
+		metadata := map[string]any{
+			"type":           "xai",
+			"access_token":   tokenStorage.AccessToken,
+			"refresh_token":  tokenStorage.RefreshToken,
+			"id_token":       tokenStorage.IDToken,
+			"token_type":     tokenStorage.TokenType,
+			"expires_in":     tokenStorage.ExpiresIn,
+			"expired":        tokenStorage.Expire,
+			"last_refresh":   tokenStorage.LastRefresh,
+			"base_url":       tokenStorage.BaseURL,
+			"redirect_uri":   tokenStorage.RedirectURI,
+			"token_endpoint": tokenStorage.TokenEndpoint,
+			"auth_kind":      "oauth",
+		}
+		if tokenStorage.Email != "" {
+			metadata["email"] = tokenStorage.Email
+		}
+		if tokenStorage.Subject != "" {
+			metadata["sub"] = tokenStorage.Subject
+		}
+
+		record := &coreauth.Auth{
+			ID:       fileName,
+			Provider: "xai",
+			FileName: fileName,
+			Label:    label,
+			Storage:  tokenStorage,
+			Metadata: metadata,
+			Attributes: map[string]string{
+				"auth_kind": "oauth",
+				"base_url":  tokenStorage.BaseURL,
+			},
+		}
+		savedPath, errSave := h.saveTokenRecord(ctx, record)
+		if errSave != nil {
+			log.Errorf("Failed to save xAI token to file: %v", errSave)
+			SetOAuthSessionError(state, "Failed to save token to file")
+			return
+		}
+
+		CompleteOAuthSession(state)
+		CompleteOAuthSessionsByProvider("xai")
+		fmt.Printf("Authentication successful! Token saved to %s\n", savedPath)
+		fmt.Println("You can now use xAI services through this CLI")
+	}()
+
+	c.JSON(200, gin.H{"status": "ok", "url": authURL, "state": state})
+}
+
 func (h *Handler) RequestKimiToken(c *gin.Context) {
 	ctx := context.Background()
 	ctx = PopulateAuthContext(ctx, c)

internal/api/handlers/management/oauth_sessions.go

@@ -242,6 +242,8 @@ func NormalizeOAuthProvider(provider string) (string, error) {
 		return "gemini", nil
 	case "antigravity", "anti-gravity":
 		return "antigravity", nil
+	case "xai", "x-ai", "x.ai", "grok":
+		return "xai", nil
 	default:
 		return "", errUnsupportedOAuthFlow
 	}

internal/api/server.go

@@ -484,6 +484,20 @@ func (s *Server) setupRoutes() {
 		c.String(http.StatusOK, oauthCallbackSuccessHTML)
 	})
 
+	s.engine.GET("/xai/callback", func(c *gin.Context) {
+		code := c.Query("code")
+		state := c.Query("state")
+		errStr := c.Query("error")
+		if errStr == "" {
+			errStr = c.Query("error_description")
+		}
+		if state != "" {
+			_, _ = managementHandlers.WriteOAuthCallbackFileForPendingSession(s.cfg.AuthDir, "xai", state, code, errStr)
+		}
+		c.Header("Content-Type", "text/html; charset=utf-8")
+		c.String(http.StatusOK, oauthCallbackSuccessHTML)
+	})
+
 	// Management routes are registered lazily by registerManagementRoutes when a secret is configured.
 }
 
@@ -685,6 +699,7 @@ func (s *Server) registerManagementRoutes() {
 		mgmt.GET("/gemini-cli-auth-url", s.mgmt.RequestGeminiCLIToken)
 		mgmt.GET("/antigravity-auth-url", s.mgmt.RequestAntigravityToken)
 		mgmt.GET("/kimi-auth-url", s.mgmt.RequestKimiToken)
+		mgmt.GET("/xai-auth-url", s.mgmt.RequestXAIToken)
 		mgmt.POST("/oauth-callback", s.mgmt.PostOAuthCallback)
 		mgmt.GET("/get-auth-status", s.mgmt.GetAuthStatus)
 	}

internal/auth/xai/pkce.go

@@ -0,0 +1,20 @@
+package xai
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+)
+
+// GeneratePKCECodes creates a verifier/challenge pair for the OAuth flow.
+func GeneratePKCECodes() (*PKCECodes, error) {
+	bytes := make([]byte, 96)
+	if _, err := rand.Read(bytes); err != nil {
+		return nil, fmt.Errorf("xai pkce: generate verifier: %w", err)
+	}
+	verifier := base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(bytes)
+	hash := sha256.Sum256([]byte(verifier))
+	challenge := base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(hash[:])
+	return &PKCECodes{CodeVerifier: verifier, CodeChallenge: challenge}, nil
+}

internal/auth/xai/token.go

@@ -0,0 +1,104 @@
+package xai
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/router-for-me/CLIProxyAPI/v7/internal/misc"
+	log "github.com/sirupsen/logrus"
+)
+
+// TokenStorage stores xAI OAuth credentials on disk.
+type TokenStorage struct {
+	Type          string `json:"type"`
+	AccessToken   string `json:"access_token"`
+	RefreshToken  string `json:"refresh_token"`
+	IDToken       string `json:"id_token,omitempty"`
+	TokenType     string `json:"token_type,omitempty"`
+	ExpiresIn     int    `json:"expires_in,omitempty"`
+	Expire        string `json:"expired,omitempty"`
+	LastRefresh   string `json:"last_refresh,omitempty"`
+	Email         string `json:"email,omitempty"`
+	Subject       string `json:"sub,omitempty"`
+	BaseURL       string `json:"base_url,omitempty"`
+	RedirectURI   string `json:"redirect_uri,omitempty"`
+	TokenEndpoint string `json:"token_endpoint,omitempty"`
+	AuthKind      string `json:"auth_kind,omitempty"`
+
+	Metadata map[string]any `json:"-"`
+}
+
+// SetMetadata allows the token store to merge status fields before saving.
+func (ts *TokenStorage) SetMetadata(meta map[string]any) {
+	ts.Metadata = meta
+}
+
+// SaveTokenToFile writes xAI credentials to a JSON auth file.
+func (ts *TokenStorage) SaveTokenToFile(authFilePath string) error {
+	misc.LogSavingCredentials(authFilePath)
+	ts.Type = "xai"
+	ts.AuthKind = "oauth"
+	if errMkdirAll := os.MkdirAll(filepath.Dir(authFilePath), 0o700); errMkdirAll != nil {
+		return fmt.Errorf("xai token storage: create directory: %w", errMkdirAll)
+	}
+	file, err := os.Create(authFilePath)
+	if err != nil {
+		return fmt.Errorf("xai token storage: create token file: %w", err)
+	}
+	defer func() {
+		if errClose := file.Close(); errClose != nil {
+			log.Errorf("xai token storage: close token file error: %v", errClose)
+		}
+	}()
+
+	data, errMerge := misc.MergeMetadata(ts, ts.Metadata)
+	if errMerge != nil {
+		return fmt.Errorf("xai token storage: merge metadata: %w", errMerge)
+	}
+	encoder := json.NewEncoder(file)
+	encoder.SetIndent("", "  ")
+	if err = encoder.Encode(data); err != nil {
+		return fmt.Errorf("xai token storage: write token file: %w", err)
+	}
+	return nil
+}
+
+// CredentialFileName returns the filename used for xAI credentials.
+func CredentialFileName(email, subject string) string {
+	email = sanitizeFileSegment(email)
+	if email != "" {
+		return fmt.Sprintf("xai-%s.json", email)
+	}
+	subject = sanitizeFileSegment(subject)
+	if subject != "" {
+		return fmt.Sprintf("xai-%s.json", subject)
+	}
+	return fmt.Sprintf("xai-%d.json", time.Now().UnixMilli())
+}
+
+func sanitizeFileSegment(value string) string {
+	value = strings.TrimSpace(value)
+	if value == "" {
+		return ""
+	}
+	var b strings.Builder
+	for _, r := range value {
+		switch {
+		case r >= 'a' && r <= 'z':
+			b.WriteRune(r)
+		case r >= 'A' && r <= 'Z':
+			b.WriteRune(r)
+		case r >= '0' && r <= '9':
+			b.WriteRune(r)
+		case r == '@' || r == '.' || r == '_' || r == '-':
+			b.WriteRune(r)
+		default:
+			b.WriteRune('-')
+		}
+	}
+	return strings.Trim(b.String(), "-")
+}

internal/auth/xai/types.go

@@ -0,0 +1,72 @@
+// Package xai provides OAuth2 authentication helpers for xAI Grok.
+package xai
+
+import "time"
+
+const (
+	// DefaultAPIBaseURL is the default xAI Responses API base URL.
+	DefaultAPIBaseURL = "https://api.x.ai/v1"
+	// Issuer is xAI's OAuth issuer.
+	Issuer = "https://auth.x.ai"
+	// DiscoveryURL is the OIDC discovery endpoint used to resolve OAuth endpoints.
+	DiscoveryURL = Issuer + "/.well-known/openid-configuration"
+	// ClientID is the public xAI Grok CLI OAuth client ID.
+	ClientID = "b1a00492-073a-47ea-816f-4c329264a828"
+	// Scope is the OAuth scope set required for xAI API access.
+	Scope = "openid profile email offline_access grok-cli:access api:access"
+	// RedirectHost is the loopback host used by xAI OAuth.
+	RedirectHost = "127.0.0.1"
+	// CallbackPort is the preferred loopback callback port.
+	CallbackPort = 56121
+	// RedirectPath is the loopback callback path registered by the xAI client.
+	RedirectPath = "/callback"
+)
+
+var refreshLead = 5 * time.Minute
+
+// RefreshLead returns the refresh lead time for xAI OAuth credentials.
+func RefreshLead() time.Duration {
+	return refreshLead
+}
+
+// PKCECodes holds the PKCE verifier/challenge pair.
+type PKCECodes struct {
+	CodeVerifier  string
+	CodeChallenge string
+}
+
+// AuthorizeURLParams contains the values used to build the xAI OAuth URL.
+type AuthorizeURLParams struct {
+	AuthorizationEndpoint string
+	RedirectURI           string
+	CodeChallenge         string
+	State                 string
+	Nonce                 string
+}
+
+// Discovery contains OAuth endpoints resolved from xAI OIDC discovery.
+type Discovery struct {
+	AuthorizationEndpoint string `json:"authorization_endpoint"`
+	TokenEndpoint         string `json:"token_endpoint"`
+}
+
+// TokenData holds xAI OAuth token data.
+type TokenData struct {
+	AccessToken  string `json:"access_token"`
+	RefreshToken string `json:"refresh_token"`
+	IDToken      string `json:"id_token,omitempty"`
+	TokenType    string `json:"token_type,omitempty"`
+	ExpiresIn    int    `json:"expires_in,omitempty"`
+	Expire       string `json:"expired,omitempty"`
+	Email        string `json:"email,omitempty"`
+	Subject      string `json:"sub,omitempty"`
+}
+
+// AuthBundle aggregates token data and OAuth metadata for persistence.
+type AuthBundle struct {
+	TokenData     TokenData
+	LastRefresh   string
+	BaseURL       string
+	RedirectURI   string
+	TokenEndpoint string
+}

internal/auth/xai/xai.go

@@ -0,0 +1,304 @@
+package xai
+
+import (
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/router-for-me/CLIProxyAPI/v7/internal/config"
+	"github.com/router-for-me/CLIProxyAPI/v7/internal/util"
+	log "github.com/sirupsen/logrus"
+)
+
+// XAIAuth performs xAI OAuth discovery, token exchange, and refresh.
+type XAIAuth struct {
+	httpClient *http.Client
+}
+
+// NewXAIAuth creates an xAI OAuth helper using config proxy settings.
+func NewXAIAuth(cfg *config.Config) *XAIAuth {
+	return NewXAIAuthWithProxyURL(cfg, "")
+}
+
+// NewXAIAuthWithProxyURL creates an xAI OAuth helper with an explicit proxy URL.
+func NewXAIAuthWithProxyURL(cfg *config.Config, proxyURL string) *XAIAuth {
+	effectiveProxyURL := strings.TrimSpace(proxyURL)
+	var sdkCfg config.SDKConfig
+	if cfg != nil {
+		sdkCfg = cfg.SDKConfig
+		if effectiveProxyURL == "" {
+			effectiveProxyURL = strings.TrimSpace(cfg.ProxyURL)
+		}
+	}
+	sdkCfg.ProxyURL = effectiveProxyURL
+	return &XAIAuth{httpClient: util.SetProxy(&sdkCfg, &http.Client{})}
+}
+
+// ValidateOAuthEndpoint validates an endpoint returned by xAI discovery.
+func ValidateOAuthEndpoint(rawURL string, field string) (string, error) {
+	rawURL = strings.TrimSpace(rawURL)
+	if rawURL == "" {
+		return "", fmt.Errorf("xai discovery %s is empty", field)
+	}
+	parsed, err := url.Parse(rawURL)
+	if err != nil {
+		return "", fmt.Errorf("xai discovery %s is invalid: %w", field, err)
+	}
+	if parsed.Scheme != "https" {
+		return "", fmt.Errorf("xai discovery %s must use https: %q", field, rawURL)
+	}
+	host := strings.ToLower(strings.TrimSpace(parsed.Hostname()))
+	if host != "x.ai" && !strings.HasSuffix(host, ".x.ai") {
+		return "", fmt.Errorf("xai discovery %s host %q is not on x.ai", field, host)
+	}
+	return rawURL, nil
+}
+
+// BuildAuthorizeURL builds the browser URL for xAI OAuth.
+func BuildAuthorizeURL(params AuthorizeURLParams) (string, error) {
+	endpoint, err := ValidateOAuthEndpoint(params.AuthorizationEndpoint, "authorization_endpoint")
+	if err != nil {
+		return "", err
+	}
+	if strings.TrimSpace(params.RedirectURI) == "" {
+		return "", fmt.Errorf("xai authorize URL: redirect URI is required")
+	}
+	if strings.TrimSpace(params.CodeChallenge) == "" {
+		return "", fmt.Errorf("xai authorize URL: code challenge is required")
+	}
+	if strings.TrimSpace(params.State) == "" {
+		return "", fmt.Errorf("xai authorize URL: state is required")
+	}
+	if strings.TrimSpace(params.Nonce) == "" {
+		return "", fmt.Errorf("xai authorize URL: nonce is required")
+	}
+	values := url.Values{
+		"response_type":         {"code"},
+		"client_id":             {ClientID},
+		"redirect_uri":          {strings.TrimSpace(params.RedirectURI)},
+		"scope":                 {Scope},
+		"code_challenge":        {strings.TrimSpace(params.CodeChallenge)},
+		"code_challenge_method": {"S256"},
+		"state":                 {strings.TrimSpace(params.State)},
+		"nonce":                 {strings.TrimSpace(params.Nonce)},
+		"plan":                  {"generic"},
+		"referrer":              {"cli-proxy-api"},
+	}
+	return endpoint + "?" + values.Encode(), nil
+}
+
+// Discover resolves xAI OAuth endpoints through OIDC discovery.
+func (a *XAIAuth) Discover(ctx context.Context) (*Discovery, error) {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, DiscoveryURL, nil)
+	if err != nil {
+		return nil, fmt.Errorf("xai discovery: create request: %w", err)
+	}
+	req.Header.Set("Accept", "application/json")
+	resp, err := a.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("xai discovery: request failed: %w", err)
+	}
+	defer func() {
+		if errClose := resp.Body.Close(); errClose != nil {
+			log.Errorf("xai discovery: close response body error: %v", errClose)
+		}
+	}()
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("xai discovery: read response: %w", err)
+	}
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("xai discovery failed with status %d: %s", resp.StatusCode, strings.TrimSpace(string(body)))
+	}
+	var payload struct {
+		AuthorizationEndpoint string `json:"authorization_endpoint"`
+		TokenEndpoint         string `json:"token_endpoint"`
+	}
+	if err = json.Unmarshal(body, &payload); err != nil {
+		return nil, fmt.Errorf("xai discovery: parse response: %w", err)
+	}
+	authorizationEndpoint, err := ValidateOAuthEndpoint(payload.AuthorizationEndpoint, "authorization_endpoint")
+	if err != nil {
+		return nil, err
+	}
+	tokenEndpoint, err := ValidateOAuthEndpoint(payload.TokenEndpoint, "token_endpoint")
+	if err != nil {
+		return nil, err
+	}
+	return &Discovery{AuthorizationEndpoint: authorizationEndpoint, TokenEndpoint: tokenEndpoint}, nil
+}
+
+// ExchangeCodeForTokens exchanges an authorization code for xAI OAuth tokens.
+func (a *XAIAuth) ExchangeCodeForTokens(ctx context.Context, code, redirectURI string, pkceCodes *PKCECodes, tokenEndpoint string) (*AuthBundle, error) {
+	if pkceCodes == nil {
+		return nil, fmt.Errorf("xai token exchange: PKCE codes are required")
+	}
+	if strings.TrimSpace(code) == "" {
+		return nil, fmt.Errorf("xai token exchange: authorization code is required")
+	}
+	if strings.TrimSpace(redirectURI) == "" {
+		return nil, fmt.Errorf("xai token exchange: redirect URI is required")
+	}
+	if strings.TrimSpace(tokenEndpoint) == "" {
+		discovery, errDiscover := a.Discover(ctx)
+		if errDiscover != nil {
+			return nil, errDiscover
+		}
+		tokenEndpoint = discovery.TokenEndpoint
+	}
+	form := url.Values{
+		"grant_type":    {"authorization_code"},
+		"code":          {strings.TrimSpace(code)},
+		"redirect_uri":  {strings.TrimSpace(redirectURI)},
+		"client_id":     {ClientID},
+		"code_verifier": {pkceCodes.CodeVerifier},
+	}
+	tokenData, err := a.postTokenForm(ctx, tokenEndpoint, form)
+	if err != nil {
+		return nil, err
+	}
+	return &AuthBundle{
+		TokenData:     *tokenData,
+		LastRefresh:   time.Now().UTC().Format(time.RFC3339),
+		BaseURL:       DefaultAPIBaseURL,
+		RedirectURI:   strings.TrimSpace(redirectURI),
+		TokenEndpoint: strings.TrimSpace(tokenEndpoint),
+	}, nil
+}
+
+// RefreshTokens refreshes an xAI access token.
+func (a *XAIAuth) RefreshTokens(ctx context.Context, refreshToken, tokenEndpoint string) (*TokenData, error) {
+	if strings.TrimSpace(refreshToken) == "" {
+		return nil, fmt.Errorf("xai token refresh: refresh token is required")
+	}
+	if strings.TrimSpace(tokenEndpoint) == "" {
+		discovery, errDiscover := a.Discover(ctx)
+		if errDiscover != nil {
+			return nil, errDiscover
+		}
+		tokenEndpoint = discovery.TokenEndpoint
+	}
+	form := url.Values{
+		"grant_type":    {"refresh_token"},
+		"client_id":     {ClientID},
+		"refresh_token": {strings.TrimSpace(refreshToken)},
+	}
+	return a.postTokenForm(ctx, tokenEndpoint, form)
+}
+
+func (a *XAIAuth) postTokenForm(ctx context.Context, tokenEndpoint string, form url.Values) (*TokenData, error) {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, strings.TrimSpace(tokenEndpoint), strings.NewReader(form.Encode()))
+	if err != nil {
+		return nil, fmt.Errorf("xai token request: create request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	req.Header.Set("Accept", "application/json")
+	resp, err := a.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("xai token request failed: %w", err)
+	}
+	defer func() {
+		if errClose := resp.Body.Close(); errClose != nil {
+			log.Errorf("xai token request: close response body error: %v", errClose)
+		}
+	}()
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("xai token response: read body: %w", err)
+	}
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("xai token request failed with status %d: %s", resp.StatusCode, strings.TrimSpace(string(body)))
+	}
+	var payload struct {
+		AccessToken  string `json:"access_token"`
+		RefreshToken string `json:"refresh_token"`
+		IDToken      string `json:"id_token"`
+		TokenType    string `json:"token_type"`
+		ExpiresIn    int    `json:"expires_in"`
+	}
+	if err = json.Unmarshal(body, &payload); err != nil {
+		return nil, fmt.Errorf("xai token response: parse body: %w", err)
+	}
+	if strings.TrimSpace(payload.AccessToken) == "" {
+		return nil, fmt.Errorf("xai token response missing access_token")
+	}
+	email, subject := parseJWTIdentity(payload.IDToken)
+	return &TokenData{
+		AccessToken:  strings.TrimSpace(payload.AccessToken),
+		RefreshToken: strings.TrimSpace(payload.RefreshToken),
+		IDToken:      strings.TrimSpace(payload.IDToken),
+		TokenType:    strings.TrimSpace(payload.TokenType),
+		ExpiresIn:    payload.ExpiresIn,
+		Expire:       time.Now().Add(time.Duration(payload.ExpiresIn) * time.Second).UTC().Format(time.RFC3339),
+		Email:        email,
+		Subject:      subject,
+	}, nil
+}
+
+// CreateTokenStorage converts an auth bundle into persistable storage.
+func (a *XAIAuth) CreateTokenStorage(bundle *AuthBundle) *TokenStorage {
+	if bundle == nil {
+		return nil
+	}
+	return &TokenStorage{
+		Type:          "xai",
+		AccessToken:   bundle.TokenData.AccessToken,
+		RefreshToken:  bundle.TokenData.RefreshToken,
+		IDToken:       bundle.TokenData.IDToken,
+		TokenType:     bundle.TokenData.TokenType,
+		ExpiresIn:     bundle.TokenData.ExpiresIn,
+		Expire:        bundle.TokenData.Expire,
+		LastRefresh:   bundle.LastRefresh,
+		Email:         strings.TrimSpace(bundle.TokenData.Email),
+		Subject:       bundle.TokenData.Subject,
+		BaseURL:       firstNonEmpty(bundle.BaseURL, DefaultAPIBaseURL),
+		RedirectURI:   bundle.RedirectURI,
+		TokenEndpoint: bundle.TokenEndpoint,
+		AuthKind:      "oauth",
+	}
+}
+
+func parseJWTIdentity(token string) (email string, subject string) {
+	parts := strings.Split(token, ".")
+	if len(parts) < 2 {
+		return "", ""
+	}
+	payload := parts[1]
+	payload += strings.Repeat("=", (4-len(payload)%4)%4)
+	raw, err := base64.URLEncoding.DecodeString(payload)
+	if err != nil {
+		return "", ""
+	}
+	var claims map[string]any
+	if err = json.Unmarshal(raw, &claims); err != nil {
+		return "", ""
+	}
+	if v, ok := claims["email"].(string); ok {
+		email = strings.TrimSpace(v)
+	}
+	if v, ok := claims["sub"].(string); ok {
+		subject = strings.TrimSpace(v)
+	}
+	return email, subject
+}
+
+func firstNonEmpty(values ...string) string {
+	for _, value := range values {
+		if trimmed := strings.TrimSpace(value); trimmed != "" {
+			return trimmed
+		}
+	}
+	return ""
+}

internal/auth/xai/xai_auth_test.go

@@ -0,0 +1,105 @@
+package xai
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"strings"
+	"testing"
+)
+
+func TestBuildAuthorizeURLIncludesXAIRequiredParameters(t *testing.T) {
+	authURL, err := BuildAuthorizeURL(AuthorizeURLParams{
+		AuthorizationEndpoint: "https://auth.x.ai/oauth/authorize",
+		RedirectURI:           "http://127.0.0.1:56121/callback",
+		CodeChallenge:         "challenge",
+		State:                 "state-123",
+		Nonce:                 "nonce-123",
+	})
+	if err != nil {
+		t.Fatalf("BuildAuthorizeURL() error = %v", err)
+	}
+
+	parsed, errParse := url.Parse(authURL)
+	if errParse != nil {
+		t.Fatalf("parse authorize URL: %v", errParse)
+	}
+	if parsed.Scheme != "https" || parsed.Host != "auth.x.ai" || parsed.Path != "/oauth/authorize" {
+		t.Fatalf("authorize URL endpoint = %s://%s%s", parsed.Scheme, parsed.Host, parsed.Path)
+	}
+
+	query := parsed.Query()
+	want := map[string]string{
+		"response_type":         "code",
+		"client_id":             ClientID,
+		"redirect_uri":          "http://127.0.0.1:56121/callback",
+		"scope":                 Scope,
+		"code_challenge":        "challenge",
+		"code_challenge_method": "S256",
+		"state":                 "state-123",
+		"nonce":                 "nonce-123",
+		"plan":                  "generic",
+		"referrer":              "cli-proxy-api",
+	}
+	for key, value := range want {
+		if got := query.Get(key); got != value {
+			t.Fatalf("%s = %q, want %q", key, got, value)
+		}
+	}
+}
+
+func TestValidateOAuthEndpointRejectsNonXAIOrigin(t *testing.T) {
+	if _, err := ValidateOAuthEndpoint("https://auth.x.ai/oauth/token", "token_endpoint"); err != nil {
+		t.Fatalf("ValidateOAuthEndpoint(xai) error = %v", err)
+	}
+	if _, err := ValidateOAuthEndpoint("http://auth.x.ai/oauth/token", "token_endpoint"); err == nil {
+		t.Fatal("expected non-HTTPS endpoint to be rejected")
+	}
+	if _, err := ValidateOAuthEndpoint("https://evil.example/oauth/token", "token_endpoint"); err == nil {
+		t.Fatal("expected non-xAI endpoint to be rejected")
+	}
+}
+
+func TestRefreshTokensPostsClientIDAndRefreshToken(t *testing.T) {
+	var gotForm url.Values
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPost {
+			t.Fatalf("method = %s, want POST", r.Method)
+		}
+		if got := r.Header.Get("Content-Type"); !strings.HasPrefix(got, "application/x-www-form-urlencoded") {
+			t.Fatalf("Content-Type = %q, want form", got)
+		}
+		if err := r.ParseForm(); err != nil {
+			t.Fatalf("ParseForm() error = %v", err)
+		}
+		gotForm = r.PostForm
+		w.Header().Set("Content-Type", "application/json")
+		_ = json.NewEncoder(w).Encode(map[string]any{
+			"access_token":  "new-access",
+			"refresh_token": "new-refresh",
+			"token_type":    "Bearer",
+			"expires_in":    3600,
+		})
+	}))
+	defer server.Close()
+
+	auth := NewXAIAuth(nil)
+	tokenData, err := auth.RefreshTokens(context.Background(), "old-refresh", server.URL)
+	if err != nil {
+		t.Fatalf("RefreshTokens() error = %v", err)
+	}
+	if tokenData.AccessToken != "new-access" {
+		t.Fatalf("access token = %q, want new-access", tokenData.AccessToken)
+	}
+	if gotForm.Get("grant_type") != "refresh_token" {
+		t.Fatalf("grant_type = %q, want refresh_token", gotForm.Get("grant_type"))
+	}
+	if gotForm.Get("client_id") != ClientID {
+		t.Fatalf("client_id = %q, want %q", gotForm.Get("client_id"), ClientID)
+	}
+	if gotForm.Get("refresh_token") != "old-refresh" {
+		t.Fatalf("refresh_token = %q, want old-refresh", gotForm.Get("refresh_token"))
+	}
+}

internal/cmd/auth_manager.go

@@ -6,7 +6,7 @@ import (
 
 // newAuthManager creates a new authentication manager instance with all supported
 // authenticators and a file-based token store. It initializes authenticators for
-// Gemini, Codex, Claude, Antigravity, and Kimi providers.
+// Gemini, Codex, Claude, Antigravity, Kimi, and xAI providers.
 //
 // Returns:
 //   - *sdkAuth.Manager: A configured authentication manager instance
@@ -18,6 +18,7 @@ func newAuthManager() *sdkAuth.Manager {
 		sdkAuth.NewClaudeAuthenticator(),
 		sdkAuth.NewAntigravityAuthenticator(),
 		sdkAuth.NewKimiAuthenticator(),
+		sdkAuth.NewXAIAuthenticator(),
 	)
 	return manager
 }

internal/cmd/xai_login.go

@@ -0,0 +1,44 @@
+package cmd
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/router-for-me/CLIProxyAPI/v7/internal/config"
+	sdkAuth "github.com/router-for-me/CLIProxyAPI/v7/sdk/auth"
+	log "github.com/sirupsen/logrus"
+)
+
+// DoXAILogin triggers the OAuth flow for the xAI provider and saves tokens.
+func DoXAILogin(cfg *config.Config, options *LoginOptions) {
+	if options == nil {
+		options = &LoginOptions{}
+	}
+
+	promptFn := options.Prompt
+	if promptFn == nil {
+		promptFn = defaultProjectPrompt()
+	}
+
+	manager := newAuthManager()
+	authOpts := &sdkAuth.LoginOptions{
+		NoBrowser:    options.NoBrowser,
+		CallbackPort: options.CallbackPort,
+		Metadata:     map[string]string{},
+		Prompt:       promptFn,
+	}
+
+	record, savedPath, err := manager.Login(context.Background(), "xai", cfg, authOpts)
+	if err != nil {
+		log.Errorf("xAI authentication failed: %v", err)
+		return
+	}
+
+	if savedPath != "" {
+		fmt.Printf("Authentication saved to %s\n", savedPath)
+	}
+	if record != nil && record.Label != "" {
+		fmt.Printf("Authenticated as %s\n", record.Label)
+	}
+	fmt.Println("xAI authentication successful!")
+}

internal/config/config.go

@@ -137,7 +137,7 @@ type Config struct {
 
 	// OAuthModelAlias defines global model name aliases for OAuth/file-backed auth channels.
 	// These aliases affect both model listing and model routing for supported channels:
-	// gemini-cli, vertex, aistudio, antigravity, claude, codex, kimi.
+	// gemini-cli, vertex, aistudio, antigravity, claude, codex, kimi, xai.
 	//
 	// NOTE: This does not apply to existing per-credential model alias features under:
 	// gemini-api-key, codex-api-key, claude-api-key, openai-compatibility, vertex-api-key, and ampcode.

internal/registry/model_definitions.go

@@ -21,6 +21,7 @@ type staticModelsJSON struct {
 	CodexPro    []*ModelInfo `json:"codex-pro"`
 	Kimi        []*ModelInfo `json:"kimi"`
 	Antigravity []*ModelInfo `json:"antigravity"`
+	XAI         []*ModelInfo `json:"xai"`
 }
 
 // GetClaudeModels returns the standard Claude model definitions.
@@ -78,6 +79,11 @@ func GetAntigravityModels() []*ModelInfo {
 	return cloneModelInfos(getModels().Antigravity)
 }
 
+// GetXAIModels returns the standard xAI Grok model definitions.
+func GetXAIModels() []*ModelInfo {
+	return cloneModelInfos(getModels().XAI)
+}
+
 // WithCodexBuiltins injects hard-coded Codex-only model definitions that should
 // not depend on remote models.json updates. Built-ins replace any matching IDs
 // already present in the provided slice.
@@ -167,6 +173,7 @@ func cloneModelInfos(models []*ModelInfo) []*ModelInfo {
 //   - codex
 //   - kimi
 //   - antigravity
+//   - xai
 func GetStaticModelDefinitionsByChannel(channel string) []*ModelInfo {
 	key := strings.ToLower(strings.TrimSpace(channel))
 	switch key {
@@ -186,6 +193,8 @@ func GetStaticModelDefinitionsByChannel(channel string) []*ModelInfo {
 		return GetKimiModels()
 	case "antigravity":
 		return GetAntigravityModels()
+	case "xai", "x-ai", "grok":
+		return GetXAIModels()
 	default:
 		return nil
 	}
@@ -208,6 +217,7 @@ func LookupStaticModelInfo(modelID string) *ModelInfo {
 		data.CodexPro,
 		data.Kimi,
 		data.Antigravity,
+		data.XAI,
 	}
 	for _, models := range allModels {
 		for _, m := range models {

internal/registry/model_updater.go

@@ -215,6 +215,7 @@ func detectChangedProviders(oldData, newData *staticModelsJSON) []string {
 		{"codex", oldData.CodexPro, newData.CodexPro},
 		{"kimi", oldData.Kimi, newData.Kimi},
 		{"antigravity", oldData.Antigravity, newData.Antigravity},
+		{"xai", oldData.XAI, newData.XAI},
 	}
 
 	seen := make(map[string]bool, len(sections))
@@ -335,6 +336,7 @@ func validateModelsCatalog(data *staticModelsJSON) error {
 		{name: "codex-pro", models: data.CodexPro},
 		{name: "kimi", models: data.Kimi},
 		{name: "antigravity", models: data.Antigravity},
+		{name: "xai", models: data.XAI},
 	}
 
 	for _, section := range requiredSections {

internal/registry/models/models.json

@@ -46,7 +46,8 @@
         "levels": [
           "low",
           "medium",
-          "high"
+          "high",
+          "xhigh"
         ]
       }
     },
@@ -2064,5 +2065,109 @@
         ]
       }
     }
+  ],
+  "xai": [
+    {
+      "id": "grok-4.3",
+      "object": "model",
+      "created": 1775606400,
+      "owned_by": "xai",
+      "type": "xai",
+      "display_name": "Grok 4.3",
+      "name": "grok-4.3",
+      "description": "xAI Grok 4.3 model for the Responses API.",
+      "context_length": 1000000,
+      "max_completion_tokens": 65536,
+      "thinking": {
+        "zero_allowed": true,
+        "levels": [
+          "none",
+          "low",
+          "medium",
+          "high"
+        ]
+      }
+    },
+    {
+      "id": "grok-4.20-0309-reasoning",
+      "object": "model",
+      "created": 1773014400,
+      "owned_by": "xai",
+      "type": "xai",
+      "display_name": "Grok 4.20 0309 Reasoning",
+      "name": "grok-4.20-0309-reasoning",
+      "description": "xAI Grok 4.20 0309 reasoning model for the Responses API.",
+      "context_length": 2000000,
+      "max_completion_tokens": 65536
+    },
+    {
+      "id": "grok-4.20-0309-non-reasoning",
+      "object": "model",
+      "created": 1773014400,
+      "owned_by": "xai",
+      "type": "xai",
+      "display_name": "Grok 4.20 0309 Non Reasoning",
+      "name": "grok-4.20-0309-non-reasoning",
+      "description": "xAI Grok 4.20 0309 non-reasoning model for the Responses API.",
+      "context_length": 2000000,
+      "max_completion_tokens": 65536
+    },
+    {
+      "id": "grok-4.20-multi-agent-0309",
+      "object": "model",
+      "created": 1773014400,
+      "owned_by": "xai",
+      "type": "xai",
+      "display_name": "Grok 4.20 Multi Agent 0309",
+      "name": "grok-4.20-multi-agent-0309",
+      "description": "xAI Grok 4.20 multi-agent model for the Responses API.",
+      "context_length": 2000000,
+      "max_completion_tokens": 65536,
+      "thinking": {
+        "levels": [
+          "low",
+          "medium",
+          "high"
+        ]
+      }
+    },
+    {
+      "id": "grok-3-mini",
+      "object": "model",
+      "created": 1740960000,
+      "owned_by": "xai",
+      "type": "xai",
+      "display_name": "Grok 3 Mini",
+      "name": "grok-3-mini",
+      "description": "xAI Grok 3 Mini model for the Responses API.",
+      "context_length": 131072,
+      "max_completion_tokens": 32768,
+      "thinking": {
+        "levels": [
+          "low",
+          "medium",
+          "high"
+        ]
+      }
+    },
+    {
+      "id": "grok-3-mini-fast",
+      "object": "model",
+      "created": 1740960000,
+      "owned_by": "xai",
+      "type": "xai",
+      "display_name": "Grok 3 Mini Fast",
+      "name": "grok-3-mini-fast",
+      "description": "xAI Grok 3 Mini Fast model for the Responses API.",
+      "context_length": 131072,
+      "max_completion_tokens": 32768,
+      "thinking": {
+        "levels": [
+          "low",
+          "medium",
+          "high"
+        ]
+      }
+    }
   ]
 }

internal/runtime/executor/xai_executor.go

@@ -0,0 +1,570 @@
+package executor
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"sort"
+	"strings"
+	"time"
+
+	xaiauth "github.com/router-for-me/CLIProxyAPI/v7/internal/auth/xai"
+	"github.com/router-for-me/CLIProxyAPI/v7/internal/config"
+	"github.com/router-for-me/CLIProxyAPI/v7/internal/runtime/executor/helps"
+	"github.com/router-for-me/CLIProxyAPI/v7/internal/thinking"
+	"github.com/router-for-me/CLIProxyAPI/v7/internal/util"
+	cliproxyauth "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/auth"
+	cliproxyexecutor "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/executor"
+	sdktranslator "github.com/router-for-me/CLIProxyAPI/v7/sdk/translator"
+	log "github.com/sirupsen/logrus"
+	"github.com/tidwall/gjson"
+	"github.com/tidwall/sjson"
+	"github.com/tiktoken-go/tokenizer"
+)
+
+var xaiDataTag = []byte("data:")
+
+// XAIExecutor is a stateless executor for xAI Grok's Responses API.
+type XAIExecutor struct {
+	cfg *config.Config
+}
+
+// NewXAIExecutor creates a new xAI executor.
+func NewXAIExecutor(cfg *config.Config) *XAIExecutor {
+	return &XAIExecutor{cfg: cfg}
+}
+
+// Identifier returns the provider identifier.
+func (e *XAIExecutor) Identifier() string {
+	return "xai"
+}
+
+// PrepareRequest injects xAI credentials into the outgoing HTTP request.
+func (e *XAIExecutor) PrepareRequest(req *http.Request, auth *cliproxyauth.Auth) error {
+	if req == nil {
+		return nil
+	}
+	token, _ := xaiCreds(auth)
+	if strings.TrimSpace(token) != "" {
+		req.Header.Set("Authorization", "Bearer "+token)
+	}
+	var attrs map[string]string
+	if auth != nil {
+		attrs = auth.Attributes
+	}
+	util.ApplyCustomHeadersFromAttrs(req, attrs)
+	return nil
+}
+
+// HttpRequest injects xAI credentials into the request and executes it.
+func (e *XAIExecutor) HttpRequest(ctx context.Context, auth *cliproxyauth.Auth, req *http.Request) (*http.Response, error) {
+	if req == nil {
+		return nil, fmt.Errorf("xai executor: request is nil")
+	}
+	if ctx == nil {
+		ctx = req.Context()
+	}
+	httpReq := req.WithContext(ctx)
+	if errPrepare := e.PrepareRequest(httpReq, auth); errPrepare != nil {
+		return nil, errPrepare
+	}
+	httpClient := helps.NewProxyAwareHTTPClient(ctx, e.cfg, auth, 0)
+	return httpClient.Do(httpReq)
+}
+
+func (e *XAIExecutor) Execute(ctx context.Context, auth *cliproxyauth.Auth, req cliproxyexecutor.Request, opts cliproxyexecutor.Options) (resp cliproxyexecutor.Response, err error) {
+	token, baseURL := xaiCreds(auth)
+	if baseURL == "" {
+		baseURL = xaiauth.DefaultAPIBaseURL
+	}
+
+	prepared, err := e.prepareResponsesRequest(ctx, req, opts, true)
+	if err != nil {
+		return resp, err
+	}
+
+	reporter := helps.NewUsageReporter(ctx, e.Identifier(), prepared.baseModel, auth)
+	defer reporter.TrackFailure(ctx, &err)
+
+	url := strings.TrimSuffix(baseURL, "/") + "/responses"
+	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(prepared.body))
+	if err != nil {
+		return resp, err
+	}
+	applyXAIHeaders(httpReq, auth, token, true, prepared.sessionID)
+	e.recordXAIRequest(ctx, auth, url, httpReq.Header.Clone(), prepared.body)
+
+	httpClient := helps.NewProxyAwareHTTPClient(ctx, e.cfg, auth, 0)
+	httpResp, err := httpClient.Do(httpReq)
+	if err != nil {
+		helps.RecordAPIResponseError(ctx, e.cfg, err)
+		return resp, err
+	}
+	defer func() {
+		if errClose := httpResp.Body.Close(); errClose != nil {
+			log.Errorf("xai executor: close response body error: %v", errClose)
+		}
+	}()
+	helps.RecordAPIResponseMetadata(ctx, e.cfg, httpResp.StatusCode, httpResp.Header.Clone())
+	if httpResp.StatusCode < 200 || httpResp.StatusCode >= 300 {
+		data, errRead := io.ReadAll(httpResp.Body)
+		if errRead != nil {
+			helps.RecordAPIResponseError(ctx, e.cfg, errRead)
+			return resp, errRead
+		}
+		helps.AppendAPIResponseChunk(ctx, e.cfg, data)
+		helps.LogWithRequestID(ctx).Debugf("request error, error status: %d, error message: %s", httpResp.StatusCode, helps.SummarizeErrorBody(httpResp.Header.Get("Content-Type"), data))
+		return resp, statusErr{code: httpResp.StatusCode, msg: string(data)}
+	}
+
+	data, err := io.ReadAll(httpResp.Body)
+	if err != nil {
+		helps.RecordAPIResponseError(ctx, e.cfg, err)
+		return resp, err
+	}
+	helps.AppendAPIResponseChunk(ctx, e.cfg, data)
+
+	outputItemsByIndex := make(map[int64][]byte)
+	var outputItemsFallback [][]byte
+	for _, line := range bytes.Split(data, []byte("\n")) {
+		if !bytes.HasPrefix(line, xaiDataTag) {
+			continue
+		}
+		eventData := bytes.TrimSpace(line[len(xaiDataTag):])
+		switch gjson.GetBytes(eventData, "type").String() {
+		case "response.output_item.done":
+			xaiCollectOutputItemDone(eventData, outputItemsByIndex, &outputItemsFallback)
+		case "response.completed":
+			if detail, ok := helps.ParseCodexUsage(eventData); ok {
+				reporter.Publish(ctx, detail)
+			}
+			completedData := xaiPatchCompletedOutput(eventData, outputItemsByIndex, outputItemsFallback)
+			var param any
+			out := sdktranslator.TranslateNonStream(ctx, prepared.to, prepared.from, req.Model, prepared.originalPayload, prepared.body, completedData, &param)
+			return cliproxyexecutor.Response{Payload: out, Headers: httpResp.Header.Clone()}, nil
+		}
+	}
+
+	return resp, statusErr{code: http.StatusRequestTimeout, msg: "xai stream error: stream disconnected before response.completed"}
+}
+
+func (e *XAIExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth.Auth, req cliproxyexecutor.Request, opts cliproxyexecutor.Options) (_ *cliproxyexecutor.StreamResult, err error) {
+	token, baseURL := xaiCreds(auth)
+	if baseURL == "" {
+		baseURL = xaiauth.DefaultAPIBaseURL
+	}
+
+	prepared, err := e.prepareResponsesRequest(ctx, req, opts, true)
+	if err != nil {
+		return nil, err
+	}
+
+	reporter := helps.NewUsageReporter(ctx, e.Identifier(), prepared.baseModel, auth)
+	defer reporter.TrackFailure(ctx, &err)
+
+	url := strings.TrimSuffix(baseURL, "/") + "/responses"
+	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(prepared.body))
+	if err != nil {
+		return nil, err
+	}
+	applyXAIHeaders(httpReq, auth, token, true, prepared.sessionID)
+	e.recordXAIRequest(ctx, auth, url, httpReq.Header.Clone(), prepared.body)
+
+	httpClient := helps.NewProxyAwareHTTPClient(ctx, e.cfg, auth, 0)
+	httpResp, err := httpClient.Do(httpReq)
+	if err != nil {
+		helps.RecordAPIResponseError(ctx, e.cfg, err)
+		return nil, err
+	}
+	helps.RecordAPIResponseMetadata(ctx, e.cfg, httpResp.StatusCode, httpResp.Header.Clone())
+	if httpResp.StatusCode < 200 || httpResp.StatusCode >= 300 {
+		data, errRead := io.ReadAll(httpResp.Body)
+		if errClose := httpResp.Body.Close(); errClose != nil {
+			log.Errorf("xai executor: close response body error: %v", errClose)
+		}
+		if errRead != nil {
+			helps.RecordAPIResponseError(ctx, e.cfg, errRead)
+			return nil, errRead
+		}
+		helps.AppendAPIResponseChunk(ctx, e.cfg, data)
+		helps.LogWithRequestID(ctx).Debugf("request error, error status: %d, error message: %s", httpResp.StatusCode, helps.SummarizeErrorBody(httpResp.Header.Get("Content-Type"), data))
+		return nil, statusErr{code: httpResp.StatusCode, msg: string(data)}
+	}
+
+	out := make(chan cliproxyexecutor.StreamChunk)
+	go func() {
+		defer close(out)
+		defer func() {
+			if errClose := httpResp.Body.Close(); errClose != nil {
+				log.Errorf("xai executor: close response body error: %v", errClose)
+			}
+		}()
+		scanner := bufio.NewScanner(httpResp.Body)
+		scanner.Buffer(nil, 52_428_800)
+		var param any
+		outputItemsByIndex := make(map[int64][]byte)
+		var outputItemsFallback [][]byte
+		for scanner.Scan() {
+			line := scanner.Bytes()
+			helps.AppendAPIResponseChunk(ctx, e.cfg, line)
+			translatedLine := bytes.Clone(line)
+			if bytes.HasPrefix(line, xaiDataTag) {
+				eventData := bytes.TrimSpace(line[len(xaiDataTag):])
+				switch gjson.GetBytes(eventData, "type").String() {
+				case "response.output_item.done":
+					xaiCollectOutputItemDone(eventData, outputItemsByIndex, &outputItemsFallback)
+				case "response.completed":
+					if detail, ok := helps.ParseCodexUsage(eventData); ok {
+						reporter.Publish(ctx, detail)
+					}
+					eventData = xaiPatchCompletedOutput(eventData, outputItemsByIndex, outputItemsFallback)
+					translatedLine = append([]byte("data: "), eventData...)
+				}
+			}
+			chunks := sdktranslator.TranslateStream(ctx, prepared.to, prepared.from, req.Model, prepared.originalPayload, prepared.body, translatedLine, &param)
+			for i := range chunks {
+				select {
+				case out <- cliproxyexecutor.StreamChunk{Payload: chunks[i]}:
+				case <-ctx.Done():
+					return
+				}
+			}
+		}
+		if errScan := scanner.Err(); errScan != nil {
+			helps.RecordAPIResponseError(ctx, e.cfg, errScan)
+			reporter.PublishFailure(ctx, errScan)
+			select {
+			case out <- cliproxyexecutor.StreamChunk{Err: errScan}:
+			case <-ctx.Done():
+			}
+		}
+	}()
+	return &cliproxyexecutor.StreamResult{Headers: httpResp.Header.Clone(), Chunks: out}, nil
+}
+
+// CountTokens estimates token count for xAI Responses requests.
+func (e *XAIExecutor) CountTokens(ctx context.Context, auth *cliproxyauth.Auth, req cliproxyexecutor.Request, opts cliproxyexecutor.Options) (cliproxyexecutor.Response, error) {
+	prepared, err := e.prepareResponsesRequest(ctx, req, opts, false)
+	if err != nil {
+		return cliproxyexecutor.Response{}, err
+	}
+	enc, err := tokenizer.Get(tokenizer.Cl100kBase)
+	if err != nil {
+		return cliproxyexecutor.Response{}, fmt.Errorf("xai executor: tokenizer init failed: %w", err)
+	}
+	count, err := enc.Count(string(prepared.body))
+	if err != nil {
+		return cliproxyexecutor.Response{}, fmt.Errorf("xai executor: token counting failed: %w", err)
+	}
+	usageJSON := fmt.Sprintf(`{"response":{"usage":{"input_tokens":%d,"output_tokens":0,"total_tokens":%d}}}`, count, count)
+	translated := sdktranslator.TranslateTokenCount(ctx, prepared.to, prepared.from, int64(count), []byte(usageJSON))
+	return cliproxyexecutor.Response{Payload: translated}, nil
+}
+
+// Refresh refreshes xAI OAuth credentials using the stored refresh token.
+func (e *XAIExecutor) Refresh(ctx context.Context, auth *cliproxyauth.Auth) (*cliproxyauth.Auth, error) {
+	log.Debugf("xai executor: refresh called")
+	if refreshed, handled, err := helps.RefreshAuthViaHome(ctx, e.cfg, auth); handled {
+		return refreshed, err
+	}
+	if auth == nil {
+		return nil, statusErr{code: http.StatusInternalServerError, msg: "xai executor: auth is nil"}
+	}
+	refreshToken := xaiMetadataString(auth.Metadata, "refresh_token")
+	if refreshToken == "" {
+		return auth, nil
+	}
+	tokenEndpoint := xaiMetadataString(auth.Metadata, "token_endpoint")
+	svc := xaiauth.NewXAIAuthWithProxyURL(e.cfg, auth.ProxyURL)
+	td, err := svc.RefreshTokens(ctx, refreshToken, tokenEndpoint)
+	if err != nil {
+		return nil, err
+	}
+	if auth.Metadata == nil {
+		auth.Metadata = make(map[string]any)
+	}
+	auth.Metadata["type"] = "xai"
+	auth.Metadata["auth_kind"] = "oauth"
+	auth.Metadata["access_token"] = td.AccessToken
+	if td.RefreshToken != "" {
+		auth.Metadata["refresh_token"] = td.RefreshToken
+	}
+	if td.IDToken != "" {
+		auth.Metadata["id_token"] = td.IDToken
+	}
+	if td.TokenType != "" {
+		auth.Metadata["token_type"] = td.TokenType
+	}
+	if td.ExpiresIn > 0 {
+		auth.Metadata["expires_in"] = td.ExpiresIn
+	}
+	if td.Expire != "" {
+		auth.Metadata["expired"] = td.Expire
+	}
+	if td.Email != "" {
+		auth.Metadata["email"] = td.Email
+	}
+	if td.Subject != "" {
+		auth.Metadata["sub"] = td.Subject
+	}
+	if tokenEndpoint != "" {
+		auth.Metadata["token_endpoint"] = tokenEndpoint
+	}
+	if xaiMetadataString(auth.Metadata, "base_url") == "" {
+		auth.Metadata["base_url"] = xaiauth.DefaultAPIBaseURL
+	}
+	auth.Metadata["last_refresh"] = time.Now().UTC().Format(time.RFC3339)
+	if auth.Attributes == nil {
+		auth.Attributes = make(map[string]string)
+	}
+	auth.Attributes["auth_kind"] = "oauth"
+	if strings.TrimSpace(auth.Attributes["base_url"]) == "" {
+		auth.Attributes["base_url"] = xaiauth.DefaultAPIBaseURL
+	}
+	return auth, nil
+}
+
+type xaiPreparedRequest struct {
+	baseModel       string
+	from            sdktranslator.Format
+	to              sdktranslator.Format
+	originalPayload []byte
+	body            []byte
+	sessionID       string
+}
+
+func (e *XAIExecutor) prepareResponsesRequest(ctx context.Context, req cliproxyexecutor.Request, opts cliproxyexecutor.Options, stream bool) (*xaiPreparedRequest, error) {
+	baseModel := thinking.ParseSuffix(req.Model).ModelName
+	from := opts.SourceFormat
+	to := sdktranslator.FromString("codex")
+	originalPayloadSource := req.Payload
+	if len(opts.OriginalRequest) > 0 {
+		originalPayloadSource = opts.OriginalRequest
+	}
+	originalPayload := bytes.Clone(originalPayloadSource)
+	originalTranslated := sdktranslator.TranslateRequest(from, to, baseModel, originalPayload, stream)
+	body := sdktranslator.TranslateRequest(from, to, baseModel, bytes.Clone(req.Payload), stream)
+
+	var err error
+	body, err = thinking.ApplyThinking(body, req.Model, from.String(), to.String(), e.Identifier())
+	if err != nil {
+		return nil, err
+	}
+
+	requestedModel := helps.PayloadRequestedModel(opts, req.Model)
+	requestPath := helps.PayloadRequestPath(opts)
+	body = helps.ApplyPayloadConfigWithRoot(e.cfg, baseModel, to.String(), "", body, originalTranslated, requestedModel, requestPath)
+	body, _ = sjson.SetBytes(body, "model", baseModel)
+	body, _ = sjson.SetBytes(body, "stream", stream)
+	body, _ = sjson.DeleteBytes(body, "previous_response_id")
+	body, _ = sjson.DeleteBytes(body, "prompt_cache_retention")
+	body, _ = sjson.DeleteBytes(body, "safety_identifier")
+	body, _ = sjson.DeleteBytes(body, "stream_options")
+	body = normalizeCodexInstructions(body)
+	body = sanitizeXAIResponsesBody(body, baseModel)
+
+	sessionID := xaiExecutionSessionID(req, opts)
+	if sessionID != "" {
+		body, _ = sjson.SetBytes(body, "prompt_cache_key", sessionID)
+	}
+
+	return &xaiPreparedRequest{
+		baseModel:       baseModel,
+		from:            from,
+		to:              to,
+		originalPayload: originalPayload,
+		body:            body,
+		sessionID:       sessionID,
+	}, nil
+}
+
+func (e *XAIExecutor) recordXAIRequest(ctx context.Context, auth *cliproxyauth.Auth, url string, headers http.Header, body []byte) {
+	var authID, authLabel, authType, authValue string
+	if auth != nil {
+		authID = auth.ID
+		authLabel = auth.Label
+		authType, authValue = auth.AccountInfo()
+	}
+	helps.RecordAPIRequest(ctx, e.cfg, helps.UpstreamRequestLog{
+		URL:       url,
+		Method:    http.MethodPost,
+		Headers:   headers,
+		Body:      body,
+		Provider:  e.Identifier(),
+		AuthID:    authID,
+		AuthLabel: authLabel,
+		AuthType:  authType,
+		AuthValue: authValue,
+	})
+}
+
+func xaiCreds(auth *cliproxyauth.Auth) (token, baseURL string) {
+	if auth == nil {
+		return "", ""
+	}
+	if auth.Attributes != nil {
+		token = strings.TrimSpace(auth.Attributes["api_key"])
+		baseURL = strings.TrimSpace(auth.Attributes["base_url"])
+	}
+	if auth.Metadata != nil {
+		if token == "" {
+			token = xaiMetadataString(auth.Metadata, "access_token")
+		}
+		if baseURL == "" {
+			baseURL = xaiMetadataString(auth.Metadata, "base_url")
+		}
+	}
+	return token, baseURL
+}
+
+func applyXAIHeaders(r *http.Request, auth *cliproxyauth.Auth, token string, stream bool, sessionID string) {
+	r.Header.Set("Content-Type", "application/json")
+	if strings.TrimSpace(token) != "" {
+		r.Header.Set("Authorization", "Bearer "+token)
+	}
+	if stream {
+		r.Header.Set("Accept", "text/event-stream")
+	} else {
+		r.Header.Set("Accept", "application/json")
+	}
+	r.Header.Set("Connection", "Keep-Alive")
+	if sessionID != "" {
+		r.Header.Set("x-grok-conv-id", sessionID)
+	}
+	var attrs map[string]string
+	if auth != nil {
+		attrs = auth.Attributes
+	}
+	util.ApplyCustomHeadersFromAttrs(r, attrs)
+}
+
+func xaiExecutionSessionID(req cliproxyexecutor.Request, opts cliproxyexecutor.Options) string {
+	if value := xaiMetadataString(opts.Metadata, cliproxyexecutor.ExecutionSessionMetadataKey); value != "" {
+		return value
+	}
+	if value := xaiMetadataString(req.Metadata, cliproxyexecutor.ExecutionSessionMetadataKey); value != "" {
+		return value
+	}
+	if promptCacheKey := gjson.GetBytes(req.Payload, "prompt_cache_key"); promptCacheKey.Exists() {
+		return strings.TrimSpace(promptCacheKey.String())
+	}
+	return ""
+}
+
+func xaiMetadataString(meta map[string]any, key string) string {
+	if len(meta) == 0 || key == "" {
+		return ""
+	}
+	value, ok := meta[key]
+	if !ok || value == nil {
+		return ""
+	}
+	switch typed := value.(type) {
+	case string:
+		return strings.TrimSpace(typed)
+	case fmt.Stringer:
+		return strings.TrimSpace(typed.String())
+	default:
+		return strings.TrimSpace(fmt.Sprint(typed))
+	}
+}
+
+func sanitizeXAIResponsesBody(body []byte, model string) []byte {
+	body = removeXAIEncryptedReasoningInclude(body)
+	if !xaiSupportsReasoningEffort(model) {
+		body, _ = sjson.DeleteBytes(body, "reasoning")
+	}
+	return body
+}
+
+func removeXAIEncryptedReasoningInclude(body []byte) []byte {
+	include := gjson.GetBytes(body, "include")
+	if !include.Exists() || !include.IsArray() {
+		return body
+	}
+	kept := make([]string, 0, len(include.Array()))
+	for _, item := range include.Array() {
+		value := strings.TrimSpace(item.String())
+		if value == "" || value == "reasoning.encrypted_content" {
+			continue
+		}
+		kept = append(kept, value)
+	}
+	body, _ = sjson.SetBytes(body, "include", kept)
+	return body
+}
+
+func xaiSupportsReasoningEffort(model string) bool {
+	name := strings.ToLower(strings.TrimSpace(thinking.ParseSuffix(model).ModelName))
+	if idx := strings.LastIndex(name, "/"); idx >= 0 {
+		name = name[idx+1:]
+	}
+	switch {
+	case strings.HasPrefix(name, "grok-3-mini"):
+		return true
+	case strings.HasPrefix(name, "grok-4.20-multi-agent"):
+		return true
+	case strings.HasPrefix(name, "grok-4.3"):
+		return true
+	default:
+		return false
+	}
+}
+
+func xaiCollectOutputItemDone(eventData []byte, outputItemsByIndex map[int64][]byte, outputItemsFallback *[][]byte) {
+	itemResult := gjson.GetBytes(eventData, "item")
+	if !itemResult.Exists() || itemResult.Type != gjson.JSON {
+		return
+	}
+	outputIndexResult := gjson.GetBytes(eventData, "output_index")
+	if outputIndexResult.Exists() {
+		outputItemsByIndex[outputIndexResult.Int()] = []byte(itemResult.Raw)
+		return
+	}
+	*outputItemsFallback = append(*outputItemsFallback, []byte(itemResult.Raw))
+}
+
+func xaiPatchCompletedOutput(eventData []byte, outputItemsByIndex map[int64][]byte, outputItemsFallback [][]byte) []byte {
+	outputResult := gjson.GetBytes(eventData, "response.output")
+	shouldPatchOutput := (!outputResult.Exists() || !outputResult.IsArray() || len(outputResult.Array()) == 0) && (len(outputItemsByIndex) > 0 || len(outputItemsFallback) > 0)
+	if !shouldPatchOutput {
+		return eventData
+	}
+
+	indexes := make([]int64, 0, len(outputItemsByIndex))
+	for idx := range outputItemsByIndex {
+		indexes = append(indexes, idx)
+	}
+	sort.Slice(indexes, func(i, j int) bool {
+		return indexes[i] < indexes[j]
+	})
+
+	outputArray := []byte("[]")
+	var buf bytes.Buffer
+	buf.WriteByte('[')
+	wrote := false
+	for _, idx := range indexes {
+		if wrote {
+			buf.WriteByte(',')
+		}
+		buf.Write(outputItemsByIndex[idx])
+		wrote = true
+	}
+	for _, item := range outputItemsFallback {
+		if wrote {
+			buf.WriteByte(',')
+		}
+		buf.Write(item)
+		wrote = true
+	}
+	buf.WriteByte(']')
+	if wrote {
+		outputArray = buf.Bytes()
+	}
+
+	patched, _ := sjson.SetRawBytes(eventData, "response.output", outputArray)
+	return patched
+}

internal/runtime/executor/xai_executor_test.go

@@ -0,0 +1,138 @@
+package executor
+
+import (
+	"context"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/router-for-me/CLIProxyAPI/v7/internal/config"
+	_ "github.com/router-for-me/CLIProxyAPI/v7/internal/translator"
+	cliproxyauth "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/auth"
+	cliproxyexecutor "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/executor"
+	sdktranslator "github.com/router-for-me/CLIProxyAPI/v7/sdk/translator"
+	"github.com/tidwall/gjson"
+)
+
+func TestXAIExecutorExecuteShapesResponsesRequest(t *testing.T) {
+	var gotPath string
+	var gotAuth string
+	var gotGrokConvID string
+	var gotOriginator string
+	var gotAccountID string
+	var gotBody []byte
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		gotPath = r.URL.Path
+		gotAuth = r.Header.Get("Authorization")
+		gotGrokConvID = r.Header.Get("x-grok-conv-id")
+		gotOriginator = r.Header.Get("Originator")
+		gotAccountID = r.Header.Get("Chatgpt-Account-Id")
+		var errRead error
+		gotBody, errRead = io.ReadAll(r.Body)
+		if errRead != nil {
+			t.Fatalf("read body: %v", errRead)
+		}
+		w.Header().Set("Content-Type", "text/event-stream")
+		_, _ = w.Write([]byte("data: {\"type\":\"response.completed\",\"response\":{\"id\":\"resp_1\",\"object\":\"response\",\"created_at\":0,\"status\":\"completed\",\"model\":\"grok-4.3\",\"output\":[{\"type\":\"message\",\"role\":\"assistant\",\"content\":[{\"type\":\"output_text\",\"text\":\"ok\"}]}],\"usage\":{\"input_tokens\":1,\"output_tokens\":1,\"total_tokens\":2}}}\n\n"))
+	}))
+	defer server.Close()
+
+	exec := NewXAIExecutor(&config.Config{})
+	auth := &cliproxyauth.Auth{
+		ID:       "xai-auth",
+		Provider: "xai",
+		Attributes: map[string]string{
+			"base_url":  server.URL,
+			"auth_kind": "oauth",
+		},
+		Metadata: map[string]any{
+			"access_token": "xai-token",
+			"email":        "user@example.com",
+		},
+	}
+
+	_, err := exec.Execute(context.Background(), auth, cliproxyexecutor.Request{
+		Model:   "grok-4.3",
+		Payload: []byte(`{"model":"grok-4.3","input":"hello","include":["reasoning.encrypted_content"],"reasoning":{"effort":"high"}}`),
+	}, cliproxyexecutor.Options{
+		SourceFormat: sdktranslator.FormatOpenAIResponse,
+		Stream:       false,
+		Metadata: map[string]any{
+			cliproxyexecutor.ExecutionSessionMetadataKey: "conv-xai-1",
+		},
+	})
+	if err != nil {
+		t.Fatalf("Execute() error = %v", err)
+	}
+
+	if gotPath != "/responses" {
+		t.Fatalf("path = %q, want /responses", gotPath)
+	}
+	if gotAuth != "Bearer xai-token" {
+		t.Fatalf("Authorization = %q, want Bearer xai-token", gotAuth)
+	}
+	if gotGrokConvID != "conv-xai-1" {
+		t.Fatalf("x-grok-conv-id = %q, want conv-xai-1", gotGrokConvID)
+	}
+	if gotOriginator != "" {
+		t.Fatalf("Originator = %q, want empty", gotOriginator)
+	}
+	if gotAccountID != "" {
+		t.Fatalf("Chatgpt-Account-Id = %q, want empty", gotAccountID)
+	}
+	if gjson.GetBytes(gotBody, "prompt_cache_key").String() != "conv-xai-1" {
+		t.Fatalf("prompt_cache_key missing from body: %s", string(gotBody))
+	}
+	if !gjson.GetBytes(gotBody, "stream").Bool() {
+		t.Fatalf("stream = false, want true; body=%s", string(gotBody))
+	}
+	if gjson.GetBytes(gotBody, "reasoning.effort").String() != "high" {
+		t.Fatalf("reasoning.effort = %q, want high; body=%s", gjson.GetBytes(gotBody, "reasoning.effort").String(), string(gotBody))
+	}
+	for _, include := range gjson.GetBytes(gotBody, "include").Array() {
+		if include.String() == "reasoning.encrypted_content" {
+			t.Fatalf("xai request must not ask for encrypted reasoning content: %s", string(gotBody))
+		}
+	}
+}
+
+func TestXAIExecutorOmitsUnsupportedReasoningEffort(t *testing.T) {
+	var gotBody []byte
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		var errRead error
+		gotBody, errRead = io.ReadAll(r.Body)
+		if errRead != nil {
+			t.Fatalf("read body: %v", errRead)
+		}
+		w.Header().Set("Content-Type", "text/event-stream")
+		_, _ = w.Write([]byte("data: {\"type\":\"response.completed\",\"response\":{\"id\":\"resp_1\",\"object\":\"response\",\"created_at\":0,\"status\":\"completed\",\"model\":\"grok-4\",\"output\":[{\"type\":\"message\",\"role\":\"assistant\",\"content\":[{\"type\":\"output_text\",\"text\":\"ok\"}]}]}}\n\n"))
+	}))
+	defer server.Close()
+
+	exec := NewXAIExecutor(&config.Config{})
+	auth := &cliproxyauth.Auth{
+		Provider: "xai",
+		Attributes: map[string]string{
+			"base_url":  server.URL,
+			"auth_kind": "oauth",
+		},
+		Metadata: map[string]any{"access_token": "xai-token"},
+	}
+
+	_, err := exec.Execute(context.Background(), auth, cliproxyexecutor.Request{
+		Model:   "grok-4",
+		Payload: []byte(`{"model":"grok-4","input":"hello","reasoning":{"effort":"high"}}`),
+	}, cliproxyexecutor.Options{
+		SourceFormat: sdktranslator.FormatOpenAIResponse,
+		Stream:       false,
+	})
+	if err != nil {
+		t.Fatalf("Execute() error = %v", err)
+	}
+
+	if gjson.GetBytes(gotBody, "reasoning").Exists() {
+		t.Fatalf("unsupported xAI model must omit reasoning key: %s", string(gotBody))
+	}
+}

internal/tui/oauth_tab.go

@@ -24,6 +24,7 @@ var oauthProviders = []oauthProvider{
 	{"Codex (OpenAI)", "codex-auth-url", "🟩"},
 	{"Antigravity", "antigravity-auth-url", "🟪"},
 	{"Kimi", "kimi-auth-url", "🟫"},
+	{"xAI", "xai-auth-url", "⬛"},
 }
 
 // oauthTabModel handles OAuth login flows.
@@ -280,6 +281,8 @@ func (m oauthTabModel) submitCallback(callbackURL string) tea.Cmd {
 					providerKey = "antigravity"
 				case "kimi-auth-url":
 					providerKey = "kimi"
+				case "xai-auth-url":
+					providerKey = "xai"
 				}
 				break
 			}