Fixed: #260

**fix(translator): handle simple string input conversion in Gemini responses**

internal/api/handlers/management/auth_files.go

@@ -346,6 +346,10 @@ func (h *Handler) buildAuthFileEntry(auth *coreauth.Auth) gin.H {
 			entry["size"] = info.Size()
 			entry["modtime"] = info.ModTime()
 		} else if os.IsNotExist(err) {
+			// Hide credentials removed from disk but still lingering in memory.
+			if !runtimeOnly && (auth.Disabled || auth.Status == coreauth.StatusDisabled || strings.EqualFold(strings.TrimSpace(auth.StatusMessage), "removed via management api")) {
+				return nil
+			}
 			entry["source"] = "memory"
 		} else {
 			log.WithError(err).Warnf("failed to stat auth file %s", path)

internal/api/handlers/management/config_lists.go

@@ -408,9 +408,7 @@ func (h *Handler) PutOpenAICompat(c *gin.Context) {
 		}
 		arr = obj.Items
 	}
-	for i := range arr {
-		normalizeOpenAICompatibilityEntry(&arr[i])
-	}
+	arr = migrateLegacyOpenAICompatibilityKeys(arr)
 	// Filter out providers with empty base-url -> remove provider entirely
 	filtered := make([]config.OpenAICompatibility, 0, len(arr))
 	for i := range arr {
@@ -418,7 +416,7 @@ func (h *Handler) PutOpenAICompat(c *gin.Context) {
 			filtered = append(filtered, arr[i])
 		}
 	}
-	h.cfg.OpenAICompatibility = filtered
+	h.cfg.OpenAICompatibility = migrateLegacyOpenAICompatibilityKeys(filtered)
 	h.cfg.SanitizeOpenAICompatibility()
 	h.persist(c)
 }
@@ -432,6 +430,7 @@ func (h *Handler) PatchOpenAICompat(c *gin.Context) {
 		c.JSON(400, gin.H{"error": "invalid body"})
 		return
 	}
+	h.cfg.OpenAICompatibility = migrateLegacyOpenAICompatibilityKeys(h.cfg.OpenAICompatibility)
 	normalizeOpenAICompatibilityEntry(body.Value)
 	// If base-url becomes empty, delete the provider instead of updating
 	if strings.TrimSpace(body.Value.BaseURL) == "" {
@@ -661,6 +660,13 @@ func normalizeOpenAICompatibilityEntry(entry *config.OpenAICompatibility) {
 	entry.APIKeys = nil
 }
 
+func migrateLegacyOpenAICompatibilityKeys(entries []config.OpenAICompatibility) []config.OpenAICompatibility {
+	for i := range entries {
+		normalizeOpenAICompatibilityEntry(&entries[i])
+	}
+	return entries
+}
+
 func normalizedOpenAICompatibilityEntries(entries []config.OpenAICompatibility) []config.OpenAICompatibility {
 	if len(entries) == 0 {
 		return nil

internal/config/config.go

@@ -479,6 +479,7 @@ func SaveConfigPreserveComments(configFile string, cfg *Config) error {
 
 	// Remove deprecated auth block before merging to avoid persisting it again.
 	removeMapKey(original.Content[0], "auth")
+	removeLegacyOpenAICompatAPIKeys(original.Content[0])
 
 	// Merge generated into original in-place, preserving comments/order of existing nodes.
 	mergeMappingPreserve(original.Content[0], generated.Content[0])
@@ -935,6 +936,25 @@ func removeMapKey(mapNode *yaml.Node, key string) {
 	}
 }
 
+func removeLegacyOpenAICompatAPIKeys(root *yaml.Node) {
+	if root == nil || root.Kind != yaml.MappingNode {
+		return
+	}
+	idx := findMapKeyIndex(root, "openai-compatibility")
+	if idx < 0 || idx+1 >= len(root.Content) {
+		return
+	}
+	seq := root.Content[idx+1]
+	if seq == nil || seq.Kind != yaml.SequenceNode {
+		return
+	}
+	for i := range seq.Content {
+		if seq.Content[i] != nil && seq.Content[i].Kind == yaml.MappingNode {
+			removeMapKey(seq.Content[i], "api-keys")
+		}
+	}
+}
+
 // normalizeCollectionNodeStyles forces YAML collections to use block notation, keeping
 // lists and maps readable. Empty sequences retain flow style ([]) so empty list markers
 // remain compact.

internal/registry/model_definitions.go

@@ -431,13 +431,13 @@ func GetOpenAIModels() []*ModelInfo {
 			SupportedParameters: []string{"tools"},
 		},
 		{
-			ID:                  "gpt-5.1-minimal",
+			ID:                  "gpt-5.1-none",
 			Object:              "model",
 			Created:             time.Now().Unix(),
 			OwnedBy:             "openai",
 			Type:                "openai",
 			Version:             "gpt-5.1-2025-11-12",
-			DisplayName:         "GPT 5 Minimal",
+			DisplayName:         "GPT 5 Low",
 			Description:         "Stable version of GPT 5, The best model for coding and agentic tasks across domains.",
 			ContextLength:       400000,
 			MaxCompletionTokens: 128000,
@@ -639,6 +639,7 @@ func GetIFlowModels() []*ModelInfo {
 		{ID: "kimi-k2-0905", DisplayName: "Kimi-K2-Instruct-0905", Description: "Moonshot Kimi K2 instruct 0905"},
 		{ID: "glm-4.6", DisplayName: "GLM-4.6", Description: "Zhipu GLM 4.6 general model"},
 		{ID: "kimi-k2", DisplayName: "Kimi-K2", Description: "Moonshot Kimi K2 general model"},
+		{ID: "kimi-k2-thinking", DisplayName: "Kimi-K2-Thinking", Description: "Moonshot Kimi K2 general model"},
 		{ID: "deepseek-v3.2", DisplayName: "DeepSeek-V3.2-Exp", Description: "DeepSeek V3.2 experimental"},
 		{ID: "deepseek-v3.1", DisplayName: "DeepSeek-V3.1-Terminus", Description: "DeepSeek V3.1 Terminus"},
 		{ID: "deepseek-r1", DisplayName: "DeepSeek-R1", Description: "DeepSeek reasoning model R1"},

internal/runtime/executor/codex_executor.go

@@ -53,71 +53,8 @@ func (e *CodexExecutor) Execute(ctx context.Context, auth *cliproxyauth.Auth, re
 	to := sdktranslator.FromString("codex")
 	body := sdktranslator.TranslateRequest(from, to, req.Model, bytes.Clone(req.Payload), false)
 
-	if util.InArray([]string{"gpt-5", "gpt-5-minimal", "gpt-5-low", "gpt-5-medium", "gpt-5-high"}, req.Model) {
-		body, _ = sjson.SetBytes(body, "model", "gpt-5")
-		switch req.Model {
-		case "gpt-5-minimal":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "minimal")
-		case "gpt-5-low":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "low")
-		case "gpt-5-medium":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		case "gpt-5-high":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
-		}
-	} else if util.InArray([]string{"gpt-5-codex", "gpt-5-codex-low", "gpt-5-codex-medium", "gpt-5-codex-high"}, req.Model) {
-		body, _ = sjson.SetBytes(body, "model", "gpt-5-codex")
-		switch req.Model {
-		case "gpt-5-codex-low":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "low")
-		case "gpt-5-codex-medium":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		case "gpt-5-codex-high":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
-		}
-	} else if util.InArray([]string{"gpt-5-codex-mini", "gpt-5-codex-mini-medium", "gpt-5-codex-mini-high"}, req.Model) {
-		body, _ = sjson.SetBytes(body, "model", "gpt-5-codex-mini")
-		switch req.Model {
-		case "gpt-5-codex-mini-medium":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		case "gpt-5-codex-mini-high":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
-		default:
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		}
-	} else if util.InArray([]string{"gpt-5.1", "gpt-5.1-minimal", "gpt-5.1-low", "gpt-5.1-medium", "gpt-5.1-high"}, req.Model) {
-		body, _ = sjson.SetBytes(body, "model", "gpt-5.1")
-		switch req.Model {
-		case "gpt-5.1-minimal":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "minimal")
-		case "gpt-5.1-low":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "low")
-		case "gpt-5.1-medium":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		case "gpt-5.1-high":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
-		}
-	} else if util.InArray([]string{"gpt-5.1-codex", "gpt-5.1-codex-low", "gpt-5.1-codex-medium", "gpt-5.1-codex-high"}, req.Model) {
-		body, _ = sjson.SetBytes(body, "model", "gpt-5.1-codex")
-		switch req.Model {
-		case "gpt-5.1-codex-low":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "low")
-		case "gpt-5.1-codex-medium":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		case "gpt-5.1-codex-high":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
-		}
-	} else if util.InArray([]string{"gpt-5.1-codex-mini", "gpt-5.1-codex-mini-medium", "gpt-5.1-codex-mini-high"}, req.Model) {
-		body, _ = sjson.SetBytes(body, "model", "gpt-5.1-codex-mini")
-		switch req.Model {
-		case "gpt-5.1-codex-mini-medium":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		case "gpt-5.1-codex-mini-high":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
-		default:
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		}
-	}
+	body = e.setReasoningEffortByAlias(req.Model, body)
+
 	body = applyPayloadConfig(e.cfg, req.Model, body)
 
 	body, _ = sjson.SetBytes(body, "stream", true)
@@ -209,69 +146,7 @@ func (e *CodexExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth.Au
 	to := sdktranslator.FromString("codex")
 	body := sdktranslator.TranslateRequest(from, to, req.Model, bytes.Clone(req.Payload), true)
 
-	if util.InArray([]string{"gpt-5", "gpt-5-minimal", "gpt-5-low", "gpt-5-medium", "gpt-5-high"}, req.Model) {
-		body, _ = sjson.SetBytes(body, "model", "gpt-5")
-		switch req.Model {
-		case "gpt-5-minimal":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "minimal")
-		case "gpt-5-low":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "low")
-		case "gpt-5-medium":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		case "gpt-5-high":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
-		}
-	} else if util.InArray([]string{"gpt-5-codex", "gpt-5-codex-low", "gpt-5-codex-medium", "gpt-5-codex-high"}, req.Model) {
-		body, _ = sjson.SetBytes(body, "model", "gpt-5-codex")
-		switch req.Model {
-		case "gpt-5-codex-low":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "low")
-		case "gpt-5-codex-medium":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		case "gpt-5-codex-high":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
-		}
-	} else if util.InArray([]string{"gpt-5-codex-mini", "gpt-5-codex-mini-medium", "gpt-5-codex-mini-high"}, req.Model) {
-		body, _ = sjson.SetBytes(body, "model", "gpt-5-codex-mini")
-		switch req.Model {
-		case "gpt-5-codex-mini-medium":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		case "gpt-5-codex-mini-high":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
-		}
-	} else if util.InArray([]string{"gpt-5.1", "gpt-5.1-minimal", "gpt-5.1-low", "gpt-5.1-medium", "gpt-5.1-high"}, req.Model) {
-		body, _ = sjson.SetBytes(body, "model", "gpt-5.1")
-		switch req.Model {
-		case "gpt-5.1-minimal":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "minimal")
-		case "gpt-5.1-low":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "low")
-		case "gpt-5.1-medium":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		case "gpt-5.1-high":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
-		}
-	} else if util.InArray([]string{"gpt-5.1-codex", "gpt-5.1-codex-low", "gpt-5.1-codex-medium", "gpt-5.1-codex-high"}, req.Model) {
-		body, _ = sjson.SetBytes(body, "model", "gpt-5.1-codex")
-		switch req.Model {
-		case "gpt-5.1-codex-low":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "low")
-		case "gpt-5.1-codex-medium":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		case "gpt-5.1-codex-high":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
-		}
-	} else if util.InArray([]string{"gpt-5.1-codex-mini", "gpt-5.1-codex-mini-medium", "gpt-5.1-codex-mini-high"}, req.Model) {
-		body, _ = sjson.SetBytes(body, "model", "gpt-5.1-codex-mini")
-		switch req.Model {
-		case "gpt-5.1-codex-mini-medium":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		case "gpt-5.1-codex-mini-high":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
-		default:
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		}
-	}
+	body = e.setReasoningEffortByAlias(req.Model, body)
 	body = applyPayloadConfig(e.cfg, req.Model, body)
 	body, _ = sjson.DeleteBytes(body, "previous_response_id")
 
@@ -367,46 +242,7 @@ func (e *CodexExecutor) CountTokens(ctx context.Context, auth *cliproxyauth.Auth
 
 	modelForCounting := req.Model
 
-	if util.InArray([]string{"gpt-5", "gpt-5-minimal", "gpt-5-low", "gpt-5-medium", "gpt-5-high"}, req.Model) {
-		modelForCounting = "gpt-5"
-		body, _ = sjson.SetBytes(body, "model", "gpt-5")
-		switch req.Model {
-		case "gpt-5-minimal":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "minimal")
-		case "gpt-5-low":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "low")
-		case "gpt-5-medium":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		case "gpt-5-high":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
-		default:
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "low")
-		}
-	} else if util.InArray([]string{"gpt-5-codex", "gpt-5-codex-low", "gpt-5-codex-medium", "gpt-5-codex-high"}, req.Model) {
-		modelForCounting = "gpt-5"
-		body, _ = sjson.SetBytes(body, "model", "gpt-5-codex")
-		switch req.Model {
-		case "gpt-5-codex-low":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "low")
-		case "gpt-5-codex-medium":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		case "gpt-5-codex-high":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
-		default:
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "low")
-		}
-	} else if util.InArray([]string{"gpt-5-codex-mini", "gpt-5-codex-mini-medium", "gpt-5-codex-mini-high"}, req.Model) {
-		modelForCounting = "gpt-5"
-		body, _ = sjson.SetBytes(body, "model", "codex-mini-latest")
-		switch req.Model {
-		case "gpt-5-codex-mini-medium":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		case "gpt-5-codex-mini-high":
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
-		default:
-			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
-		}
-	}
+	body = e.setReasoningEffortByAlias(req.Model, body)
 
 	body, _ = sjson.DeleteBytes(body, "previous_response_id")
 	body, _ = sjson.SetBytes(body, "stream", false)
@@ -426,6 +262,71 @@ func (e *CodexExecutor) CountTokens(ctx context.Context, auth *cliproxyauth.Auth
 	return cliproxyexecutor.Response{Payload: []byte(translated)}, nil
 }
 
+func (e *CodexExecutor) setReasoningEffortByAlias(modelName string, payload []byte) []byte {
+	if util.InArray([]string{"gpt-5", "gpt-5-minimal", "gpt-5-low", "gpt-5-medium", "gpt-5-high"}, modelName) {
+		payload, _ = sjson.SetBytes(payload, "model", "gpt-5")
+		switch modelName {
+		case "gpt-5-minimal":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "minimal")
+		case "gpt-5-low":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "low")
+		case "gpt-5-medium":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "medium")
+		case "gpt-5-high":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "high")
+		}
+	} else if util.InArray([]string{"gpt-5-codex", "gpt-5-codex-low", "gpt-5-codex-medium", "gpt-5-codex-high"}, modelName) {
+		payload, _ = sjson.SetBytes(payload, "model", "gpt-5-codex")
+		switch modelName {
+		case "gpt-5-codex-low":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "low")
+		case "gpt-5-codex-medium":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "medium")
+		case "gpt-5-codex-high":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "high")
+		}
+	} else if util.InArray([]string{"gpt-5-codex-mini", "gpt-5-codex-mini-medium", "gpt-5-codex-mini-high"}, modelName) {
+		payload, _ = sjson.SetBytes(payload, "model", "gpt-5-codex-mini")
+		switch modelName {
+		case "gpt-5-codex-mini-medium":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "medium")
+		case "gpt-5-codex-mini-high":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "high")
+		}
+	} else if util.InArray([]string{"gpt-5.1", "gpt-5.1-none", "gpt-5.1-low", "gpt-5.1-medium", "gpt-5.1-high"}, modelName) {
+		payload, _ = sjson.SetBytes(payload, "model", "gpt-5.1")
+		switch modelName {
+		case "gpt-5.1-none":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "none")
+		case "gpt-5.1-low":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "low")
+		case "gpt-5.1-medium":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "medium")
+		case "gpt-5.1-high":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "high")
+		}
+	} else if util.InArray([]string{"gpt-5.1-codex", "gpt-5.1-codex-low", "gpt-5.1-codex-medium", "gpt-5.1-codex-high"}, modelName) {
+		payload, _ = sjson.SetBytes(payload, "model", "gpt-5.1-codex")
+		switch modelName {
+		case "gpt-5.1-codex-low":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "low")
+		case "gpt-5.1-codex-medium":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "medium")
+		case "gpt-5.1-codex-high":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "high")
+		}
+	} else if util.InArray([]string{"gpt-5.1-codex-mini", "gpt-5.1-codex-mini-medium", "gpt-5.1-codex-mini-high"}, modelName) {
+		payload, _ = sjson.SetBytes(payload, "model", "gpt-5.1-codex-mini")
+		switch modelName {
+		case "gpt-5.1-codex-mini-medium":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "medium")
+		case "gpt-5.1-codex-mini-high":
+			payload, _ = sjson.SetBytes(payload, "reasoning.effort", "high")
+		}
+	}
+	return payload
+}
+
 func tokenizerForCodexModel(model string) (tokenizer.Codec, error) {
 	sanitized := strings.ToLower(strings.TrimSpace(model))
 	switch {

internal/translator/codex/claude/codex_claude_request.go

@@ -204,7 +204,7 @@ func ConvertClaudeRequestToCodex(modelName string, inputRawJSON []byte, _ bool)
 				}
 				tool, _ = sjson.Set(tool, "name", name)
 			}
-			tool, _ = sjson.SetRaw(tool, "parameters", toolResult.Get("input_schema").Raw)
+			tool, _ = sjson.SetRaw(tool, "parameters", normalizeToolParameters(toolResult.Get("input_schema").Raw))
 			tool, _ = sjson.Delete(tool, "input_schema")
 			tool, _ = sjson.Delete(tool, "parameters.$schema")
 			tool, _ = sjson.Set(tool, "strict", false)
@@ -334,3 +334,22 @@ func buildReverseMapFromClaudeOriginalToShort(original []byte) map[string]string
 	}
 	return m
 }
+
+// normalizeToolParameters ensures object schemas contain at least an empty properties map.
+func normalizeToolParameters(raw string) string {
+	raw = strings.TrimSpace(raw)
+	if raw == "" || raw == "null" || !gjson.Valid(raw) {
+		return `{"type":"object","properties":{}}`
+	}
+	schema := raw
+	result := gjson.Parse(raw)
+	schemaType := result.Get("type").String()
+	if schemaType == "" {
+		schema, _ = sjson.Set(schema, "type", "object")
+		schemaType = "object"
+	}
+	if schemaType == "object" && !result.Get("properties").Exists() {
+		schema, _ = sjson.SetRaw(schema, "properties", `{}`)
+	}
+	return schema
+}

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

@@ -156,6 +156,11 @@ func ConvertOpenAIResponsesRequestToGemini(modelName string, inputRawJSON []byte
 
 			return true
 		})
+	} else if input.Exists() && input.Type == gjson.String {
+		// Simple string input conversion to user message
+		userContent := `{"role":"user","parts":[{"text":""}]}`
+		userContent, _ = sjson.Set(userContent, "parts.0.text", input.String())
+		out, _ = sjson.SetRaw(out, "contents.-1", userContent)
 	}
 
 	// Convert tools to Gemini functionDeclarations format

internal/translator/openai/claude/openai_claude_response.go

@@ -284,29 +284,36 @@ func convertOpenAIStreamingChunkToAnthropic(rawJSON []byte, param *ConvertOpenAI
 
 	// Handle usage information separately (this comes in a later chunk)
 	// Only process if usage has actual values (not null)
-	if usage := root.Get("usage"); usage.Exists() && usage.Type != gjson.Null && param.FinishReason != "" {
-		// Check if usage has actual token counts
-		promptTokens := usage.Get("prompt_tokens")
-		completionTokens := usage.Get("completion_tokens")
+	if param.FinishReason != "" {
+		usage := root.Get("usage")
+		var inputTokens, outputTokens int64
+		if usage.Exists() && usage.Type != gjson.Null {
+			// Check if usage has actual token counts
+			promptTokens := usage.Get("prompt_tokens")
+			completionTokens := usage.Get("completion_tokens")
 
-		if promptTokens.Exists() && completionTokens.Exists() {
-			// Send message_delta with usage
-			messageDelta := map[string]interface{}{
-				"type": "message_delta",
-				"delta": map[string]interface{}{
-					"stop_reason":   mapOpenAIFinishReasonToAnthropic(param.FinishReason),
-					"stop_sequence": nil,
-				},
-				"usage": map[string]interface{}{
-					"input_tokens":  promptTokens.Int(),
-					"output_tokens": completionTokens.Int(),
-				},
+			if promptTokens.Exists() && completionTokens.Exists() {
+				inputTokens = promptTokens.Int()
+				outputTokens = completionTokens.Int()
 			}
-
-			messageDeltaJSON, _ := json.Marshal(messageDelta)
-			results = append(results, "event: message_delta\ndata: "+string(messageDeltaJSON)+"\n\n")
-			param.MessageDeltaSent = true
 		}
+		// Send message_delta with usage
+		messageDelta := map[string]interface{}{
+			"type": "message_delta",
+			"delta": map[string]interface{}{
+				"stop_reason":   mapOpenAIFinishReasonToAnthropic(param.FinishReason),
+				"stop_sequence": nil,
+			},
+			"usage": map[string]interface{}{
+				"input_tokens":  inputTokens,
+				"output_tokens": outputTokens,
+			},
+		}
+
+		messageDeltaJSON, _ := json.Marshal(messageDelta)
+		results = append(results, "event: message_delta\ndata: "+string(messageDeltaJSON)+"\n\n")
+		param.MessageDeltaSent = true
+
 	}
 
 	return results
@@ -413,6 +420,11 @@ func convertOpenAINonStreamingToAnthropic(rawJSON []byte) []string {
 			"input_tokens":  usage.Get("prompt_tokens").Int(),
 			"output_tokens": usage.Get("completion_tokens").Int(),
 		}
+	} else {
+		response["usage"] = map[string]interface{}{
+			"input_tokens":  0,
+			"output_tokens": 0,
+		}
 	}
 
 	responseJSON, _ := json.Marshal(response)
@@ -601,6 +613,8 @@ func ConvertOpenAIResponseToClaudeNonStream(_ context.Context, _ string, origina
 		usageJSON, _ = sjson.Set(usageJSON, "output_tokens", respUsage.Get("completion_tokens").Int())
 		parsedUsage := gjson.Parse(usageJSON).Value().(map[string]interface{})
 		response["usage"] = parsedUsage
+	} else {
+		response["usage"] = `{"input_tokens":0,"output_tokens":0}`
 	}
 
 	if response["stop_reason"] == nil {