diff --git a/run_agent.py b/run_agent.py
index 96d4d8517fe6..a787a139ea0c 100644
--- a/run_agent.py
+++ b/run_agent.py
@@ -1265,7 +1265,7 @@ def __init__(
         # does NOT support the Responses API — skip the upgrade for Azure
         # (openai.azure.com), even though it looks OpenAI-compatible.
         if (
-            api_mode is None
+            (api_mode is None or api_mode == "chat_completions")
             and self.api_mode == "chat_completions"
             and self.provider != "copilot-acp"
             and not str(self.base_url or "").lower().startswith("acp://copilot")