diff --git a/relay/adaptor/doubao/main.go b/relay/adaptor/doubao/main.go
index c9726957e3..f529c6ac7b 100644
--- a/relay/adaptor/doubao/main.go
+++ b/relay/adaptor/doubao/main.go
@@ -19,6 +19,12 @@ func GetRequestURL(meta *meta.Meta) (string, error) {
 		return fmt.Sprintf("%s/api/v3/chat/completions", meta.BaseURL), nil
 	case relaymode.Embeddings:
 		return fmt.Sprintf("%s/api/v3/embeddings", meta.BaseURL), nil
+	case relaymode.ClaudeMessages:
+		// 豆包支持 Claude Messages API 格式，转换为 ChatCompletions 处理
+		if strings.HasPrefix(meta.ActualModelName, "bot") {
+			return fmt.Sprintf("%s/api/v3/bots/chat/completions", meta.BaseURL), nil
+		}
+		return fmt.Sprintf("%s/api/v3/chat/completions", meta.BaseURL), nil
 	default:
 	}
 	return "", errors.Errorf("unsupported relay mode %d for doubao", meta.Mode)
diff --git a/relay/adaptor/openai_compatible/claude_convert.go b/relay/adaptor/openai_compatible/claude_convert.go
index 065cf50717..465adb33c2 100644
--- a/relay/adaptor/openai_compatible/claude_convert.go
+++ b/relay/adaptor/openai_compatible/claude_convert.go
@@ -261,8 +261,15 @@ func ConvertOpenAIStreamToClaudeSSE(c *gin.Context, resp *http.Response, promptT
 
 		// Process choices
 		for _, choice := range chunk.Choices {
-			// Thinking delta
+			// Thinking delta - try Thinking field first, fallback to ReasoningContent
+			var thinkingContent *string
 			if choice.Delta.Thinking != nil && *choice.Delta.Thinking != "" {
+				thinkingContent = choice.Delta.Thinking
+			} else if choice.Delta.ReasoningContent != nil && *choice.Delta.ReasoningContent != "" {
+				thinkingContent = choice.Delta.ReasoningContent
+			}
+
+			if thinkingContent != nil && *thinkingContent != "" {
 				if thinkingIndex == -1 {
 					// Start thinking block at next index
 					start := map[string]any{
@@ -279,7 +286,7 @@ func ConvertOpenAIStreamToClaudeSSE(c *gin.Context, resp *http.Response, promptT
 					thinkingIndex = nextIndex
 					nextIndex++
 				}
-				thinkingDelta := *choice.Delta.Thinking
+				thinkingDelta := *thinkingContent
 				accumThinking += thinkingDelta
 				delta := map[string]any{
 					"type":  "content_block_delta",