diff --git a/openjudge/models/openai_chat_model.py b/openjudge/models/openai_chat_model.py
index 5eb20331c..dcff72da3 100644
--- a/openjudge/models/openai_chat_model.py
+++ b/openjudge/models/openai_chat_model.py
@@ -243,7 +243,7 @@ def _is_valid_message(msg: dict) -> bool:
                 )
                 structured_model = {"type": "json_object"}
 
-            # kwargs["response_format"] = structured_model
+            kwargs["response_format"] = structured_model
 
             if not self.stream:
                 kwargs.pop("stream", None)