diff --git a/tests/entrypoints/openai/chat_completion/test_chat.py b/tests/entrypoints/openai/chat_completion/test_chat.py
index 212839f78d5c..80f54f6800ae 100644
--- a/tests/entrypoints/openai/chat_completion/test_chat.py
+++ b/tests/entrypoints/openai/chat_completion/test_chat.py
@@ -845,9 +845,10 @@ async def test_chat_completion_n_parameter_non_streaming(
     chat_completion = await client.chat.completions.create(
         model=model_name,
         messages=messages,
-        max_completion_tokens=20,
-        temperature=0.7,
+        max_completion_tokens=50,
+        temperature=1.0,
         n=3,
+        seed=42,
         stream=False,
     )
 
@@ -859,7 +860,6 @@ async def test_chat_completion_n_parameter_non_streaming(
         assert choice.message.content is not None
         assert len(choice.message.content) > 0
 
-    # Verify all responses are different (highly likely with temperature > 0)
     contents = [choice.message.content for choice in chat_completion.choices]
     assert len(set(contents)) > 1, "Expected different responses with n=3"