diff --git a/python/sglang/lang/backend/openai.py b/python/sglang/lang/backend/openai.py
index 502d2f3e4..a2d006bb7 100644
--- a/python/sglang/lang/backend/openai.py
+++ b/python/sglang/lang/backend/openai.py
@@ -161,7 +161,11 @@ class OpenAI(BaseBackend):
                 prompt = s.text_
 
             kwargs = sampling_params.to_openai_kwargs()
-            if self.model_name.startswith("o1") or self.model_name.startswith("o3"):
+            if (
+                self.model_name.startswith("o1")
+                or self.model_name.startswith("o3")
+                or "o1" in self.model_name
+            ):
                 kwargs.pop("max_tokens", None)
             else:
                 kwargs.pop("max_completion_tokens", None)