Intermittent issues connecting MCP to 5.3

We are experiencing intermittent reliability issues with our MCP. Most recently, the connection failed entirely with a generic error message; our logs indicate the requests are failing before reaching our backend. We isolated the issue to 5.3 as our app works fine with the legacy models. That said, we’d like to investigate the root cause of these connection drops with your team.

Maybe this is related.

Trying to use a custom connector (app) using chat gpt with the “Instant” model the result we get is “model not found”. This doesn’t happen with “thinking” mode.