Merge pull request #185 from router-for-me/thinking

Feat: Add reasoning effort support for Gemini models

internal/registry/model_definitions.go

@@ -84,6 +84,7 @@ func GeminiModels() []*ModelInfo {
 			InputTokenLimit:            1048576,
 			OutputTokenLimit:           65536,
 			SupportedGenerationMethods: []string{"generateContent", "countTokens", "createCachedContent", "batchGenerateContent"},
+			Thinking:                   &ThinkingSupport{Min: 0, Max: 24576, ZeroAllowed: true, DynamicAllowed: true},
 		},
 		{
 			ID:                         "gemini-2.5-pro",
@@ -98,6 +99,7 @@ func GeminiModels() []*ModelInfo {
 			InputTokenLimit:            1048576,
 			OutputTokenLimit:           65536,
 			SupportedGenerationMethods: []string{"generateContent", "countTokens", "createCachedContent", "batchGenerateContent"},
+			Thinking:                   &ThinkingSupport{Min: 128, Max: 32768, ZeroAllowed: false, DynamicAllowed: true},
 		},
 		{
 			ID:                         "gemini-2.5-flash-lite",
@@ -112,6 +114,7 @@ func GeminiModels() []*ModelInfo {
 			InputTokenLimit:            1048576,
 			OutputTokenLimit:           65536,
 			SupportedGenerationMethods: []string{"generateContent", "countTokens", "createCachedContent", "batchGenerateContent"},
+			Thinking:                   &ThinkingSupport{Min: 512, Max: 24576, ZeroAllowed: true, DynamicAllowed: true},
 		},
 		{
 			ID:                         "gemini-2.5-flash-image-preview",
@@ -126,6 +129,7 @@ func GeminiModels() []*ModelInfo {
 			InputTokenLimit:            1048576,
 			OutputTokenLimit:           8192,
 			SupportedGenerationMethods: []string{"generateContent", "countTokens", "createCachedContent", "batchGenerateContent"},
+			// image models don't support thinkingConfig; leave Thinking nil
 		},
 		{
 			ID:                         "gemini-2.5-flash-image",
@@ -140,6 +144,7 @@ func GeminiModels() []*ModelInfo {
 			InputTokenLimit:            1048576,
 			OutputTokenLimit:           8192,
 			SupportedGenerationMethods: []string{"generateContent", "countTokens", "createCachedContent", "batchGenerateContent"},
+			// image models don't support thinkingConfig; leave Thinking nil
 		},
 	}
 }
@@ -152,9 +157,8 @@ func GetGeminiCLIModels() []*ModelInfo { return GeminiModels() }
 
 // GetAIStudioModels returns the Gemini model definitions for AI Studio integrations
 func GetAIStudioModels() []*ModelInfo {
-	models := make([]*ModelInfo, 0, 8)
+	base := GeminiModels()
-	models = append(models, GeminiModels()...)
+	return append(base,
-	models = append(models,
 		&ModelInfo{
 			ID:                         "gemini-pro-latest",
 			Object:                     "model",
@@ -168,6 +172,7 @@ func GetAIStudioModels() []*ModelInfo {
 			InputTokenLimit:            1048576,
 			OutputTokenLimit:           65536,
 			SupportedGenerationMethods: []string{"generateContent", "countTokens", "createCachedContent", "batchGenerateContent"},
+			Thinking:                   &ThinkingSupport{Min: 128, Max: 32768, ZeroAllowed: false, DynamicAllowed: true},
 		},
 		&ModelInfo{
 			ID:                         "gemini-flash-latest",
@@ -182,6 +187,7 @@ func GetAIStudioModels() []*ModelInfo {
 			InputTokenLimit:            1048576,
 			OutputTokenLimit:           65536,
 			SupportedGenerationMethods: []string{"generateContent", "countTokens", "createCachedContent", "batchGenerateContent"},
+			Thinking:                   &ThinkingSupport{Min: 0, Max: 24576, ZeroAllowed: true, DynamicAllowed: true},
 		},
 		&ModelInfo{
 			ID:                         "gemini-flash-lite-latest",
@@ -196,9 +202,9 @@ func GetAIStudioModels() []*ModelInfo {
 			InputTokenLimit:            1048576,
 			OutputTokenLimit:           65536,
 			SupportedGenerationMethods: []string{"generateContent", "countTokens", "createCachedContent", "batchGenerateContent"},
+			Thinking:                   &ThinkingSupport{Min: 512, Max: 24576, ZeroAllowed: true, DynamicAllowed: true},
 		},
 	)
-	return models
 }
 
 // GetOpenAIModels returns the standard OpenAI model definitions

internal/registry/model_registry.go

@@ -45,6 +45,23 @@ type ModelInfo struct {
 	MaxCompletionTokens int `json:"max_completion_tokens,omitempty"`
 	// SupportedParameters lists supported parameters
 	SupportedParameters []string `json:"supported_parameters,omitempty"`
+
+	// Thinking holds provider-specific reasoning/thinking budget capabilities.
+	// This is optional and currently used for Gemini thinking budget normalization.
+	Thinking *ThinkingSupport `json:"thinking,omitempty"`
+}
+
+// ThinkingSupport describes a model family's supported internal reasoning budget range.
+// Values are interpreted in provider-native token units.
+type ThinkingSupport struct {
+	// Min is the minimum allowed thinking budget (inclusive).
+	Min int `json:"min,omitempty"`
+	// Max is the maximum allowed thinking budget (inclusive).
+	Max int `json:"max,omitempty"`
+	// ZeroAllowed indicates whether 0 is a valid value (to disable thinking).
+	ZeroAllowed bool `json:"zero_allowed,omitempty"`
+	// DynamicAllowed indicates whether -1 is a valid value (dynamic thinking budget).
+	DynamicAllowed bool `json:"dynamic_allowed,omitempty"`
 }
 
 // ModelRegistration tracks a model's availability
@@ -652,6 +669,17 @@ func (r *ModelRegistry) GetModelProviders(modelID string) []string {
 	return result
 }
 
+// GetModelInfo returns the registered ModelInfo for the given model ID, if present.
+// Returns nil if the model is unknown to the registry.
+func (r *ModelRegistry) GetModelInfo(modelID string) *ModelInfo {
+	r.mutex.RLock()
+	defer r.mutex.RUnlock()
+	if reg, ok := r.models[modelID]; ok && reg != nil {
+		return reg.Info
+	}
+	return nil
+}
+
 // convertModelToMap converts ModelInfo to the appropriate format for different handler types
 func (r *ModelRegistry) convertModelToMap(model *ModelInfo, handlerType string) map[string]any {
 	if model == nil {

internal/runtime/executor/aistudio_executor.go

@@ -256,10 +256,14 @@ func (e *AIStudioExecutor) translateRequest(req cliproxyexecutor.Request, opts c
 	from := opts.SourceFormat
 	to := sdktranslator.FromString("gemini")
 	payload := sdktranslator.TranslateRequest(from, to, req.Model, bytes.Clone(req.Payload), stream)
-	if budgetOverride, includeOverride, ok := util.GeminiThinkingFromMetadata(req.Metadata); ok {
+	if budgetOverride, includeOverride, ok := util.GeminiThinkingFromMetadata(req.Metadata); ok && util.ModelSupportsThinking(req.Model) {
+		if budgetOverride != nil {
+			norm := util.NormalizeThinkingBudget(req.Model, *budgetOverride)
+			budgetOverride = &norm
+		}
 		payload = util.ApplyGeminiThinkingConfig(payload, budgetOverride, includeOverride)
 	}
-	payload = disableGeminiThinkingConfig(payload, req.Model)
+	payload = util.StripThinkingConfigIfUnsupported(req.Model, payload)
 	payload = fixGeminiImageAspectRatio(req.Model, payload)
 	metadataAction := "generateContent"
 	if req.Metadata != nil {

internal/runtime/executor/gemini_cli_executor.go

@@ -63,9 +63,14 @@ func (e *GeminiCLIExecutor) Execute(ctx context.Context, auth *cliproxyauth.Auth
 	to := sdktranslator.FromString("gemini-cli")
 	budgetOverride, includeOverride, hasOverride := util.GeminiThinkingFromMetadata(req.Metadata)
 	basePayload := sdktranslator.TranslateRequest(from, to, req.Model, bytes.Clone(req.Payload), false)
-	if hasOverride {
+	if hasOverride && util.ModelSupportsThinking(req.Model) {
+		if budgetOverride != nil {
+			norm := util.NormalizeThinkingBudget(req.Model, *budgetOverride)
+			budgetOverride = &norm
+		}
 		basePayload = util.ApplyGeminiCLIThinkingConfig(basePayload, budgetOverride, includeOverride)
 	}
+	basePayload = util.StripThinkingConfigIfUnsupported(req.Model, basePayload)
 	basePayload = fixGeminiCLIImageAspectRatio(req.Model, basePayload)
 
 	action := "generateContent"
@@ -92,7 +97,7 @@ func (e *GeminiCLIExecutor) Execute(ctx context.Context, auth *cliproxyauth.Auth
 	var lastStatus int
 	var lastBody []byte
 
-	for _, attemptModel := range models {
+	for idx, attemptModel := range models {
 		payload := append([]byte(nil), basePayload...)
 		if action == "countTokens" {
 			payload = deleteJSONField(payload, "project")
@@ -101,7 +106,6 @@ func (e *GeminiCLIExecutor) Execute(ctx context.Context, auth *cliproxyauth.Auth
 			payload = setJSONField(payload, "project", projectID)
 			payload = setJSONField(payload, "model", attemptModel)
 		}
-		payload = disableGeminiThinkingConfig(payload, attemptModel)
 
 		tok, errTok := tokenSource.Token()
 		if errTok != nil {
@@ -166,7 +170,11 @@ func (e *GeminiCLIExecutor) Execute(ctx context.Context, auth *cliproxyauth.Auth
 		lastBody = append([]byte(nil), data...)
 		log.Debugf("request error, error status: %d, error body: %s", httpResp.StatusCode, string(data))
 		if httpResp.StatusCode == 429 {
-			log.Debugf("gemini cli executor: rate limited, retrying with next model")
+			if idx+1 < len(models) {
+				log.Debugf("gemini cli executor: rate limited, retrying with next model: %s", models[idx+1])
+			} else {
+				log.Debug("gemini cli executor: rate limited, no additional fallback model")
+			}
 			continue
 		}
 
@@ -196,9 +204,14 @@ func (e *GeminiCLIExecutor) ExecuteStream(ctx context.Context, auth *cliproxyaut
 	to := sdktranslator.FromString("gemini-cli")
 	budgetOverride, includeOverride, hasOverride := util.GeminiThinkingFromMetadata(req.Metadata)
 	basePayload := sdktranslator.TranslateRequest(from, to, req.Model, bytes.Clone(req.Payload), true)
-	if hasOverride {
+	if hasOverride && util.ModelSupportsThinking(req.Model) {
+		if budgetOverride != nil {
+			norm := util.NormalizeThinkingBudget(req.Model, *budgetOverride)
+			budgetOverride = &norm
+		}
 		basePayload = util.ApplyGeminiCLIThinkingConfig(basePayload, budgetOverride, includeOverride)
 	}
+	basePayload = util.StripThinkingConfigIfUnsupported(req.Model, basePayload)
 	basePayload = fixGeminiCLIImageAspectRatio(req.Model, basePayload)
 
 	projectID := strings.TrimSpace(stringValue(auth.Metadata, "project_id"))
@@ -219,11 +232,10 @@ func (e *GeminiCLIExecutor) ExecuteStream(ctx context.Context, auth *cliproxyaut
 	var lastStatus int
 	var lastBody []byte
 
-	for _, attemptModel := range models {
+	for idx, attemptModel := range models {
 		payload := append([]byte(nil), basePayload...)
 		payload = setJSONField(payload, "project", projectID)
 		payload = setJSONField(payload, "model", attemptModel)
-		payload = disableGeminiThinkingConfig(payload, attemptModel)
 
 		tok, errTok := tokenSource.Token()
 		if errTok != nil {
@@ -282,7 +294,11 @@ func (e *GeminiCLIExecutor) ExecuteStream(ctx context.Context, auth *cliproxyaut
 			lastBody = append([]byte(nil), data...)
 			log.Debugf("request error, error status: %d, error body: %s", httpResp.StatusCode, string(data))
 			if httpResp.StatusCode == 429 {
-				log.Debugf("gemini cli executor: rate limited, retrying with next model")
+				if idx+1 < len(models) {
+					log.Debugf("gemini cli executor: rate limited, retrying with next model: %s", models[idx+1])
+				} else {
+					log.Debug("gemini cli executor: rate limited, no additional fallback model")
+				}
 				continue
 			}
 			err = statusErr{code: httpResp.StatusCode, msg: string(data)}
@@ -393,12 +409,16 @@ func (e *GeminiCLIExecutor) CountTokens(ctx context.Context, auth *cliproxyauth.
 	budgetOverride, includeOverride, hasOverride := util.GeminiThinkingFromMetadata(req.Metadata)
 	for _, attemptModel := range models {
 		payload := sdktranslator.TranslateRequest(from, to, attemptModel, bytes.Clone(req.Payload), false)
-		if hasOverride {
+		if hasOverride && util.ModelSupportsThinking(req.Model) {
+			if budgetOverride != nil {
+				norm := util.NormalizeThinkingBudget(req.Model, *budgetOverride)
+				budgetOverride = &norm
+			}
 			payload = util.ApplyGeminiCLIThinkingConfig(payload, budgetOverride, includeOverride)
 		}
 		payload = deleteJSONField(payload, "project")
 		payload = deleteJSONField(payload, "model")
-		payload = disableGeminiThinkingConfig(payload, attemptModel)
+		payload = util.StripThinkingConfigIfUnsupported(req.Model, payload)
 		payload = fixGeminiCLIImageAspectRatio(attemptModel, payload)
 
 		tok, errTok := tokenSource.Token()
@@ -623,29 +643,6 @@ func cliPreviewFallbackOrder(model string) []string {
 	}
 }
 
-func disableGeminiThinkingConfig(body []byte, model string) []byte {
-	if !geminiModelDisallowsThinking(model) {
-		return body
-	}
-
-	updated := deleteJSONField(body, "request.generationConfig.thinkingConfig")
-	updated = deleteJSONField(updated, "generationConfig.thinkingConfig")
-	return updated
-}
-
-func geminiModelDisallowsThinking(model string) bool {
-	if model == "" {
-		return false
-	}
-	lower := strings.ToLower(model)
-	for _, marker := range []string{"gemini-2.5-flash-image-preview", "gemini-2.5-flash-image"} {
-		if strings.Contains(lower, marker) {
-			return true
-		}
-	}
-	return false
-}
-
 // setJSONField sets a top-level JSON field on a byte slice payload via sjson.
 func setJSONField(body []byte, key, value string) []byte {
 	if key == "" {

internal/runtime/executor/gemini_executor.go

@@ -78,10 +78,14 @@ func (e *GeminiExecutor) Execute(ctx context.Context, auth *cliproxyauth.Auth, r
 	from := opts.SourceFormat
 	to := sdktranslator.FromString("gemini")
 	body := sdktranslator.TranslateRequest(from, to, req.Model, bytes.Clone(req.Payload), false)
-	if budgetOverride, includeOverride, ok := util.GeminiThinkingFromMetadata(req.Metadata); ok {
+	if budgetOverride, includeOverride, ok := util.GeminiThinkingFromMetadata(req.Metadata); ok && util.ModelSupportsThinking(req.Model) {
+		if budgetOverride != nil {
+			norm := util.NormalizeThinkingBudget(req.Model, *budgetOverride)
+			budgetOverride = &norm
+		}
 		body = util.ApplyGeminiThinkingConfig(body, budgetOverride, includeOverride)
 	}
-	body = disableGeminiThinkingConfig(body, req.Model)
+	body = util.StripThinkingConfigIfUnsupported(req.Model, body)
 	body = fixGeminiImageAspectRatio(req.Model, body)
 
 	action := "generateContent"
@@ -166,10 +170,14 @@ func (e *GeminiExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth.A
 	from := opts.SourceFormat
 	to := sdktranslator.FromString("gemini")
 	body := sdktranslator.TranslateRequest(from, to, req.Model, bytes.Clone(req.Payload), true)
-	if budgetOverride, includeOverride, ok := util.GeminiThinkingFromMetadata(req.Metadata); ok {
+	if budgetOverride, includeOverride, ok := util.GeminiThinkingFromMetadata(req.Metadata); ok && util.ModelSupportsThinking(req.Model) {
+		if budgetOverride != nil {
+			norm := util.NormalizeThinkingBudget(req.Model, *budgetOverride)
+			budgetOverride = &norm
+		}
 		body = util.ApplyGeminiThinkingConfig(body, budgetOverride, includeOverride)
 	}
-	body = disableGeminiThinkingConfig(body, req.Model)
+	body = util.StripThinkingConfigIfUnsupported(req.Model, body)
 	body = fixGeminiImageAspectRatio(req.Model, body)
 
 	url := fmt.Sprintf("%s/%s/models/%s:%s", glEndpoint, glAPIVersion, req.Model, "streamGenerateContent")
@@ -269,10 +277,14 @@ func (e *GeminiExecutor) CountTokens(ctx context.Context, auth *cliproxyauth.Aut
 	from := opts.SourceFormat
 	to := sdktranslator.FromString("gemini")
 	translatedReq := sdktranslator.TranslateRequest(from, to, req.Model, bytes.Clone(req.Payload), false)
-	if budgetOverride, includeOverride, ok := util.GeminiThinkingFromMetadata(req.Metadata); ok {
+	if budgetOverride, includeOverride, ok := util.GeminiThinkingFromMetadata(req.Metadata); ok && util.ModelSupportsThinking(req.Model) {
+		if budgetOverride != nil {
+			norm := util.NormalizeThinkingBudget(req.Model, *budgetOverride)
+			budgetOverride = &norm
+		}
 		translatedReq = util.ApplyGeminiThinkingConfig(translatedReq, budgetOverride, includeOverride)
 	}
-	translatedReq = disableGeminiThinkingConfig(translatedReq, req.Model)
+	translatedReq = util.StripThinkingConfigIfUnsupported(req.Model, translatedReq)
 	translatedReq = fixGeminiImageAspectRatio(req.Model, translatedReq)
 	respCtx := context.WithValue(ctx, "alt", opts.Alt)
 	translatedReq, _ = sjson.DeleteBytes(translatedReq, "tools")

internal/translator/gemini-cli/claude/gemini-cli_claude_request.go

@@ -11,6 +11,7 @@ import (
 	"strings"
 
 	client "github.com/router-for-me/CLIProxyAPI/v6/internal/interfaces"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
 	"github.com/tidwall/gjson"
 	"github.com/tidwall/sjson"
 )
@@ -136,7 +137,7 @@ func ConvertClaudeRequestToCLI(modelName string, inputRawJSON []byte, _ bool) []
 	}
 
 	// Build output Gemini CLI request JSON
-	out := `{"model":"","request":{"contents":[],"generationConfig":{"thinkingConfig":{"include_thoughts":true}}}}`
+	out := `{"model":"","request":{"contents":[]}}`
 	out, _ = sjson.Set(out, "model", modelName)
 	if systemInstruction != nil {
 		b, _ := json.Marshal(systemInstruction)
@@ -151,21 +152,16 @@ func ConvertClaudeRequestToCLI(modelName string, inputRawJSON []byte, _ bool) []
 		out, _ = sjson.SetRaw(out, "request.tools", string(b))
 	}
 
-	// Map reasoning and sampling configs
+	// Map Anthropic thinking -> Gemini thinkingBudget/include_thoughts when type==enabled
-	reasoningEffortResult := gjson.GetBytes(rawJSON, "reasoning_effort")
+	if t := gjson.GetBytes(rawJSON, "thinking"); t.Exists() && t.IsObject() && util.ModelSupportsThinking(modelName) {
-	if reasoningEffortResult.String() == "none" {
+		if t.Get("type").String() == "enabled" {
-		out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.include_thoughts", false)
+			if b := t.Get("budget_tokens"); b.Exists() && b.Type == gjson.Number {
-		out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.thinkingBudget", 0)
+				budget := int(b.Int())
-	} else if reasoningEffortResult.String() == "auto" {
+				budget = util.NormalizeThinkingBudget(modelName, budget)
-		out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.thinkingBudget", -1)
+				out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.thinkingBudget", budget)
-	} else if reasoningEffortResult.String() == "low" {
+				out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.include_thoughts", true)
-		out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.thinkingBudget", 1024)
+			}
-	} else if reasoningEffortResult.String() == "medium" {
+		}
-		out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.thinkingBudget", 8192)
-	} else if reasoningEffortResult.String() == "high" {
-		out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.thinkingBudget", 24576)
-	} else {
-		out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.thinkingBudget", -1)
 	}
 	if v := gjson.GetBytes(rawJSON, "temperature"); v.Exists() && v.Type == gjson.Number {
 		out, _ = sjson.Set(out, "request.generationConfig.temperature", v.Num)

internal/translator/gemini-cli/openai/chat-completions/gemini-cli_openai_request.go

@@ -26,32 +26,57 @@ import (
 //   - []byte: The transformed request data in Gemini CLI API format
 func ConvertOpenAIRequestToGeminiCLI(modelName string, inputRawJSON []byte, _ bool) []byte {
 	rawJSON := bytes.Clone(inputRawJSON)
-	// Base envelope
+	// Base envelope (no default thinkingConfig)
-	out := []byte(`{"project":"","request":{"contents":[],"generationConfig":{"thinkingConfig":{"include_thoughts":true}}},"model":"gemini-2.5-pro"}`)
+	out := []byte(`{"project":"","request":{"contents":[]},"model":"gemini-2.5-pro"}`)
 
 	// Model
 	out, _ = sjson.SetBytes(out, "model", modelName)
 
 	// Reasoning effort -> thinkingBudget/include_thoughts
+	// Note: OpenAI official fields take precedence over extra_body.google.thinking_config
 	re := gjson.GetBytes(rawJSON, "reasoning_effort")
-	if re.Exists() {
+	hasOfficialThinking := re.Exists()
+	if hasOfficialThinking && util.ModelSupportsThinking(modelName) {
 		switch re.String() {
 		case "none":
 			out, _ = sjson.DeleteBytes(out, "request.generationConfig.thinkingConfig.include_thoughts")
 			out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.thinkingBudget", 0)
 		case "auto":
 			out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.thinkingBudget", -1)
+			out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.include_thoughts", true)
 		case "low":
-			out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.thinkingBudget", 1024)
+			out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.thinkingBudget", util.NormalizeThinkingBudget(modelName, 1024))
+			out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.include_thoughts", true)
 		case "medium":
-			out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.thinkingBudget", 8192)
+			out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.thinkingBudget", util.NormalizeThinkingBudget(modelName, 8192))
+			out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.include_thoughts", true)
 		case "high":
-			out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.thinkingBudget", 24576)
+			out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.thinkingBudget", util.NormalizeThinkingBudget(modelName, 32768))
+			out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.include_thoughts", true)
 		default:
 			out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.thinkingBudget", -1)
+			out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.include_thoughts", true)
+		}
+	}
+
+	// Cherry Studio extension extra_body.google.thinking_config (effective only when official fields are absent)
+	if !hasOfficialThinking && util.ModelSupportsThinking(modelName) {
+		if tc := gjson.GetBytes(rawJSON, "extra_body.google.thinking_config"); tc.Exists() && tc.IsObject() {
+			var setBudget bool
+			var normalized int
+			if v := tc.Get("thinking_budget"); v.Exists() {
+				normalized = util.NormalizeThinkingBudget(modelName, int(v.Int()))
+				out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.thinkingBudget", normalized)
+				setBudget = true
+			}
+			if v := tc.Get("include_thoughts"); v.Exists() {
+				out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.include_thoughts", v.Bool())
+			} else if setBudget {
+				if normalized != 0 {
+					out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.include_thoughts", true)
+				}
+			}
 		}
-	} else {
-		out, _ = sjson.SetBytes(out, "request.generationConfig.thinkingConfig.thinkingBudget", -1)
 	}
 
 	// Temperature/top_p/top_k

internal/translator/gemini/claude/gemini_claude_request.go

@@ -11,6 +11,7 @@ import (
 	"strings"
 
 	client "github.com/router-for-me/CLIProxyAPI/v6/internal/interfaces"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
 	"github.com/tidwall/gjson"
 	"github.com/tidwall/sjson"
 )
@@ -129,7 +130,7 @@ func ConvertClaudeRequestToGemini(modelName string, inputRawJSON []byte, _ bool)
 	}
 
 	// Build output Gemini CLI request JSON
-	out := `{"contents":[],"generationConfig":{"thinkingConfig":{"include_thoughts":true}}}`
+	out := `{"contents":[]}`
 	out, _ = sjson.Set(out, "model", modelName)
 	if systemInstruction != nil {
 		b, _ := json.Marshal(systemInstruction)
@@ -144,21 +145,16 @@ func ConvertClaudeRequestToGemini(modelName string, inputRawJSON []byte, _ bool)
 		out, _ = sjson.SetRaw(out, "tools", string(b))
 	}
 
-	// Map reasoning and sampling configs
+	// Map Anthropic thinking -> Gemini thinkingBudget/include_thoughts when enabled
-	reasoningEffortResult := gjson.GetBytes(rawJSON, "reasoning_effort")
+	if t := gjson.GetBytes(rawJSON, "thinking"); t.Exists() && t.IsObject() && util.ModelSupportsThinking(modelName) {
-	if reasoningEffortResult.String() == "none" {
+		if t.Get("type").String() == "enabled" {
-		out, _ = sjson.Set(out, "generationConfig.thinkingConfig.include_thoughts", false)
+			if b := t.Get("budget_tokens"); b.Exists() && b.Type == gjson.Number {
-		out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", 0)
+				budget := int(b.Int())
-	} else if reasoningEffortResult.String() == "auto" {
+				budget = util.NormalizeThinkingBudget(modelName, budget)
-		out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", -1)
+				out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", budget)
-	} else if reasoningEffortResult.String() == "low" {
+				out, _ = sjson.Set(out, "generationConfig.thinkingConfig.include_thoughts", true)
-		out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", 1024)
+			}
-	} else if reasoningEffortResult.String() == "medium" {
+		}
-		out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", 8192)
-	} else if reasoningEffortResult.String() == "high" {
-		out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", 24576)
-	} else {
-		out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", -1)
 	}
 	if v := gjson.GetBytes(rawJSON, "temperature"); v.Exists() && v.Type == gjson.Number {
 		out, _ = sjson.Set(out, "generationConfig.temperature", v.Num)

internal/translator/gemini/openai/chat-completions/gemini_openai_request.go

@@ -26,32 +26,58 @@ import (
 //   - []byte: The transformed request data in Gemini API format
 func ConvertOpenAIRequestToGemini(modelName string, inputRawJSON []byte, _ bool) []byte {
 	rawJSON := bytes.Clone(inputRawJSON)
-	// Base envelope
+	// Base envelope (no default thinkingConfig)
-	out := []byte(`{"contents":[],"generationConfig":{"thinkingConfig":{"include_thoughts":true}}}`)
+	out := []byte(`{"contents":[]}`)
 
 	// Model
 	out, _ = sjson.SetBytes(out, "model", modelName)
 
 	// Reasoning effort -> thinkingBudget/include_thoughts
+	// Note: OpenAI official fields take precedence over extra_body.google.thinking_config
 	re := gjson.GetBytes(rawJSON, "reasoning_effort")
-	if re.Exists() {
+	hasOfficialThinking := re.Exists()
+	if hasOfficialThinking && util.ModelSupportsThinking(modelName) {
 		switch re.String() {
 		case "none":
 			out, _ = sjson.DeleteBytes(out, "generationConfig.thinkingConfig.include_thoughts")
 			out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.thinkingBudget", 0)
 		case "auto":
 			out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.thinkingBudget", -1)
+			out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.include_thoughts", true)
 		case "low":
-			out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.thinkingBudget", 1024)
+			out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.thinkingBudget", util.NormalizeThinkingBudget(modelName, 1024))
+			out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.include_thoughts", true)
 		case "medium":
-			out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.thinkingBudget", 8192)
+			out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.thinkingBudget", util.NormalizeThinkingBudget(modelName, 8192))
+			out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.include_thoughts", true)
 		case "high":
-			out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.thinkingBudget", 24576)
+			out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.thinkingBudget", util.NormalizeThinkingBudget(modelName, 32768))
+			out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.include_thoughts", true)
 		default:
 			out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.thinkingBudget", -1)
+			out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.include_thoughts", true)
+		}
+	}
+
+	// Cherry Studio extension extra_body.google.thinking_config (effective only when official fields are absent)
+	if !hasOfficialThinking && util.ModelSupportsThinking(modelName) {
+		if tc := gjson.GetBytes(rawJSON, "extra_body.google.thinking_config"); tc.Exists() && tc.IsObject() {
+			var setBudget bool
+			var normalized int
+			if v := tc.Get("thinking_budget"); v.Exists() {
+				// Normalize budget to model range
+				normalized = util.NormalizeThinkingBudget(modelName, int(v.Int()))
+				out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.thinkingBudget", normalized)
+				setBudget = true
+			}
+			if v := tc.Get("include_thoughts"); v.Exists() {
+				out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.include_thoughts", v.Bool())
+			} else if setBudget {
+				if normalized != 0 {
+					out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.include_thoughts", true)
+				}
+			}
 		}
-	} else {
-		out, _ = sjson.SetBytes(out, "generationConfig.thinkingConfig.thinkingBudget", -1)
 	}
 
 	// Temperature/top_p/top_k

internal/translator/gemini/openai/responses/gemini_openai-responses_request.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"strings"
 
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
 	"github.com/tidwall/gjson"
 	"github.com/tidwall/sjson"
 )
@@ -15,8 +16,8 @@ func ConvertOpenAIResponsesRequestToGemini(modelName string, inputRawJSON []byte
 	_ = modelName // Unused but required by interface
 	_ = stream    // Unused but required by interface
 
-	// Base Gemini API template
+	// Base Gemini API template (do not include thinkingConfig by default)
-	out := `{"contents":[],"generationConfig":{"thinkingConfig":{"include_thoughts":true}}}`
+	out := `{"contents":[]}`
 
 	root := gjson.ParseBytes(rawJSON)
 
@@ -242,23 +243,52 @@ func ConvertOpenAIResponsesRequestToGemini(modelName string, inputRawJSON []byte
 		out, _ = sjson.Set(out, "generationConfig.stopSequences", sequences)
 	}
 
-	if reasoningEffort := root.Get("reasoning.effort"); reasoningEffort.Exists() {
+	// OpenAI official reasoning fields take precedence
+	hasOfficialThinking := root.Get("reasoning.effort").Exists()
+	if hasOfficialThinking && util.ModelSupportsThinking(modelName) {
+		reasoningEffort := root.Get("reasoning.effort")
 		switch reasoningEffort.String() {
 		case "none":
 			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.include_thoughts", false)
 			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", 0)
 		case "auto":
 			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", -1)
+			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.include_thoughts", true)
 		case "minimal":
-			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", 1024)
+			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", util.NormalizeThinkingBudget(modelName, 1024))
+			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.include_thoughts", true)
 		case "low":
-			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", 4096)
+			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", util.NormalizeThinkingBudget(modelName, 4096))
+			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.include_thoughts", true)
 		case "medium":
-			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", 8192)
+			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", util.NormalizeThinkingBudget(modelName, 8192))
+			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.include_thoughts", true)
 		case "high":
-			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", 24576)
+			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", util.NormalizeThinkingBudget(modelName, 32768))
+			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.include_thoughts", true)
 		default:
 			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", -1)
+			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.include_thoughts", true)
+		}
+	}
+
+	// Cherry Studio extension (applies only when official fields are missing)
+	if !hasOfficialThinking && util.ModelSupportsThinking(modelName) {
+		if tc := root.Get("extra_body.google.thinking_config"); tc.Exists() && tc.IsObject() {
+			var setBudget bool
+			var normalized int
+			if v := tc.Get("thinking_budget"); v.Exists() {
+				normalized = util.NormalizeThinkingBudget(modelName, int(v.Int()))
+				out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", normalized)
+				setBudget = true
+			}
+			if v := tc.Get("include_thoughts"); v.Exists() {
+				out, _ = sjson.Set(out, "generationConfig.thinkingConfig.include_thoughts", v.Bool())
+			} else if setBudget {
+				if normalized != 0 {
+					out, _ = sjson.Set(out, "generationConfig.thinkingConfig.include_thoughts", true)
+				}
+			}
 		}
 	}
 	return []byte(out)

internal/util/gemini_thinking.go

@@ -179,3 +179,19 @@ func GeminiThinkingFromMetadata(metadata map[string]any) (*int, *bool, bool) {
 	}
 	return budgetPtr, includePtr, matched
 }
+
+// StripThinkingConfigIfUnsupported removes thinkingConfig from the request body
+// when the target model does not advertise Thinking capability. It cleans both
+// standard Gemini and Gemini CLI JSON envelopes. This acts as a final safety net
+// in case upstream injected thinking for an unsupported model.
+func StripThinkingConfigIfUnsupported(model string, body []byte) []byte {
+	if ModelSupportsThinking(model) || len(body) == 0 {
+		return body
+	}
+	updated := body
+	// Gemini CLI path
+	updated, _ = sjson.DeleteBytes(updated, "request.generationConfig.thinkingConfig")
+	// Standard Gemini path
+	updated, _ = sjson.DeleteBytes(updated, "generationConfig.thinkingConfig")
+	return updated
+}

internal/util/thinking.go

@@ -0,0 +1,69 @@
+package util
+
+import (
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/registry"
+)
+
+// ModelSupportsThinking reports whether the given model has Thinking capability
+// according to the model registry metadata (provider-agnostic).
+func ModelSupportsThinking(model string) bool {
+	if model == "" {
+		return false
+	}
+	if info := registry.GetGlobalRegistry().GetModelInfo(model); info != nil {
+		return info.Thinking != nil
+	}
+	return false
+}
+
+// NormalizeThinkingBudget clamps the requested thinking budget to the
+// supported range for the specified model using registry metadata only.
+// If the model is unknown or has no Thinking metadata, returns the original budget.
+// For dynamic (-1), returns -1 if DynamicAllowed; otherwise approximates mid-range
+// or min (0 if zero is allowed and mid <= 0).
+func NormalizeThinkingBudget(model string, budget int) int {
+	if budget == -1 { // dynamic
+		if found, min, max, zeroAllowed, dynamicAllowed := thinkingRangeFromRegistry(model); found {
+			if dynamicAllowed {
+				return -1
+			}
+			mid := (min + max) / 2
+			if mid <= 0 && zeroAllowed {
+				return 0
+			}
+			if mid <= 0 {
+				return min
+			}
+			return mid
+		}
+		return -1
+	}
+	if found, min, max, zeroAllowed, _ := thinkingRangeFromRegistry(model); found {
+		if budget == 0 {
+			if zeroAllowed {
+				return 0
+			}
+			return min
+		}
+		if budget < min {
+			return min
+		}
+		if budget > max {
+			return max
+		}
+		return budget
+	}
+	return budget
+}
+
+// thinkingRangeFromRegistry attempts to read thinking ranges from the model registry.
+func thinkingRangeFromRegistry(model string) (found bool, min int, max int, zeroAllowed bool, dynamicAllowed bool) {
+	if model == "" {
+		return false, 0, 0, false, false
+	}
+	info := registry.GetGlobalRegistry().GetModelInfo(model)
+	if info == nil || info.Thinking == nil {
+		return false, 0, 0, false, false
+	}
+	return true, info.Thinking.Min, info.Thinking.Max, info.Thinking.ZeroAllowed, info.Thinking.DynamicAllowed
+}