diff --git a/maubot_llmplus/thrid_platform.py b/maubot_llmplus/thrid_platform.py
index e981ed7..309e0d5 100644
--- a/maubot_llmplus/thrid_platform.py
+++ b/maubot_llmplus/thrid_platform.py
@@ -36,7 +36,12 @@ class OpenAi(Platform):
         }
 
         if 'max_tokens' in self.config and self.max_tokens:
-            data["max_tokens"] = self.max_tokens
+            # 如果是gpt5的，就用max_completion_tokens
+            if 'gpt-5' in self.model:
+                data["max_completion_tokens"] = self.max_tokens
+            else:
+                # 如果是gpt4之前的，就是用max_tokens
+                data["max_tokens"] = self.max_tokens
 
         if 'temperature' in self.config and self.temperature:
             data["temperature"] = self.temperature