Sudden influx of "✗ Execution failed: CAPIError: 400 The requested model is not supported"

[logar16]

Describe the bug

I'm trying to use Copilot and suddenly I keep getting this error after almost every request: "✗ Execution failed: CAPIError: 400 The requested model is not supported". I can't tell why it's happening, and in some cases, it seems to stop agent progress and in others it doesn't. It's so opaque, can you explain what is going wrong? Can you give me better error info so I can fix it or have Copilot fix itself or tell you more specifically what's going wrong?

Affected version

1.0.3

Steps to reproduce the behavior

I ask agent to do a task, it starts and then I hear the bell sound that copilot is done/needs human input--et voila--there is the error: "✗ Execution failed: CAPIError: 400 The requested model is not supported". I asked the agent if it was due to a subagent it was using and to avoid subagents. That doesn't fix it, I still get it.

Expected behavior

I would expect no 400 error. Barring that, I would expect more information about what part of Copilot hit the error so I can avoid that (e.g. subagents/tasks or some specific tool).

Additional context

This is interesting because I got the error but then copilot just kept going. I had another terminal with copilot and it was dead in the water because of the error.