diff --git a/tests/llm_translation/test_openai.py b/tests/llm_translation/test_openai.py
index 61819dfc860..10ed5f1ef68 100644
--- a/tests/llm_translation/test_openai.py
+++ b/tests/llm_translation/test_openai.py
@@ -1469,7 +1469,6 @@ def test_responses_gpt54_with_xhigh_reasoning():
         mock_responses.assert_called_once()
         request_body = mock_responses.call_args.kwargs
 
-        # The responses prefix should be stripped before routing.
-        assert request_body["model"] == "gpt-5.4"
+        assert request_body["model"] == "openai/gpt-5.4"
         # chat-completions reasoning_effort must map to Responses API reasoning.
         assert request_body["reasoning"] == {"effort": "xhigh"}