fix(gemini): update response template to omit finishReason until known

internal/registry/model_definitions.go

@@ -8,6 +8,15 @@ import "time"
 // GetClaudeModels returns the standard Claude model definitions
 func GetClaudeModels() []*ModelInfo {
 	return []*ModelInfo{
+
+		{
+			ID:          "claude-haiku-4-5-20251001",
+			Object:      "model",
+			Created:     1759276800, // 2025-10-01
+			OwnedBy:     "anthropic",
+			Type:        "claude",
+			DisplayName: "Claude 4.5 Haiku",
+		},
 		{
 			ID:          "claude-sonnet-4-5-20250929",
 			Object:      "model",

internal/translator/openai/gemini/openai_gemini_response.go

@@ -97,8 +97,8 @@ func ConvertOpenAIResponseToGemini(_ context.Context, _ string, originalRequestR
 		var results []string
 
 		choices.ForEach(func(choiceIndex, choice gjson.Result) bool {
-			// Base Gemini response template
-			template := `{"candidates":[{"content":{"parts":[],"role":"model"},"finishReason":"STOP","index":0}]}`
+			// Base Gemini response template without finishReason; set when known
+			template := `{"candidates":[{"content":{"parts":[],"role":"model"},"index":0}]}`
 
 			// Set model if available
 			if model := root.Get("model"); model.Exists() {
@@ -514,8 +514,8 @@ func tryParseNumber(s string) (interface{}, bool) {
 func ConvertOpenAIResponseToGeminiNonStream(_ context.Context, _ string, originalRequestRawJSON, requestRawJSON, rawJSON []byte, _ *any) string {
 	root := gjson.ParseBytes(rawJSON)
 
-	// Base Gemini response template
-	out := `{"candidates":[{"content":{"parts":[],"role":"model"},"finishReason":"STOP","index":0}]}`
+	// Base Gemini response template without finishReason; set when known
+	out := `{"candidates":[{"content":{"parts":[],"role":"model"},"index":0}]}`
 
 	// Set model if available
 	if model := root.Get("model"); model.Exists() {

internal/translator/openai/openai/responses/openai_openai-responses_response.go

@@ -67,9 +67,20 @@ func ConvertOpenAIChatCompletionsResponseToOpenAIResponses(ctx context.Context,
 		rawJSON = bytes.TrimSpace(rawJSON[5:])
 	}
 
+	rawJSON = bytes.TrimSpace(rawJSON)
+	if len(rawJSON) == 0 {
+		return []string{}
+	}
+	if bytes.Equal(rawJSON, []byte("[DONE]")) {
+		return []string{}
+	}
+
 	root := gjson.ParseBytes(rawJSON)
-	obj := root.Get("object").String()
-	if obj != "chat.completion.chunk" {
+	obj := root.Get("object")
+	if obj.Exists() && obj.String() != "" && obj.String() != "chat.completion.chunk" {
+		return []string{}
+	}
+	if !root.Get("choices").Exists() || !root.Get("choices").IsArray() {
 		return []string{}
 	}