Update app.py

app.py

@@ -85,7 +85,7 @@ def chat_stream(message, history):
         logger.info(f"API验证响应内容: {verify_response.text[:200]}...")  # 只记录前200个字符
         
         payload = {
-            "model": "gpt-3.5-turbo",
+            "model": "gpt-4o",
             "messages": messages,
             "stream": True,
             "temperature": 0.7