diff --git a/vllm/entrypoints/openai/serving_chat.py b/vllm/entrypoints/openai/serving_chat.py
index c6333d170c66..678ec5618ef9 100644
--- a/vllm/entrypoints/openai/serving_chat.py
+++ b/vllm/entrypoints/openai/serving_chat.py
@@ -1761,6 +1761,7 @@ def _make_request_with_harmony(
         assert not self.supports_browsing
         assert not self.supports_code_interpreter
         sys_msg = get_system_message(
+            model_identity=(request.chat_template_kwargs or {}).get("model_identity"),
             reasoning_effort=request.reasoning_effort,
             browser_description=None,
             python_description=None,