Hi @pikachu89,

From what I can see, this does not appear to be the expected 13-day bearer token lifetime. In Model Serving, the SDK is designed to resolve auth on each request, and in the serving runtime, the injected token is read from the mounted credentials file and only cached for 300 seconds before being reread. Given that restarting the endpoint restores functionality, this points more to stale runtime auth state than to an intended token expiry.

As a practical mitigation, I’d suggest creating the WorkspaceClient inside the inference path rather than at model load time, and if possible moving to the newer databricks-openai client since get_open_ai_client() is now deprecated.

If this answer resolves your question, could you mark it as “Accept as Solution”? That helps other users quickly find the correct fix.