diff --git a/src/providers/claude-to-openai-proxy.ts b/src/providers/claude-to-openai-proxy.ts
index 6733da1..d0a903b 100644
--- a/src/providers/claude-to-openai-proxy.ts
+++ b/src/providers/claude-to-openai-proxy.ts
@@ -182,7 +182,10 @@ const convertClaudeToOpenAIRequest = (reqJson: any): any => {
                 }
             }
 
-            messages.push(openaiMsg);
+            // 只有当消息有实际内容时才添加（避免空 user 消息）
+            if (openaiMsg.content != null || openaiMsg.tool_calls) {
+                messages.push(openaiMsg);
+            }
         }
     }