Github Copilot commit message fails with a model error

[Jdyn]

The problem

I'm encountering really weird behavior with the copilot commit message generation. When I attempt to generate a commit message I get this error from the network tab:

It hits: https://api.individual.githubcopilot.com/agents/github-desktop-commit-message-generation

and returns

call to the agent failed with error: generatecommitmessageagent execute with responses API failed: model gpt-5-mini is not supported via Responses API. not found: model "gpt-5-mini" is not supported via Responses API

The strange part is this doesn't occur on my other computer with the same latest version installed. On my other computer, it works perfectly. Any thoughts here?

Release version

v3.5.6-alpha4

Operating system and distro

MacOS, M1

Steps to reproduce the behavior

1. Click the Github copilot generate commit message

Specific to GitHub Desktop Plus?

The issue does not occur on the official app

Log files

Opening the network tab in the app reveals

call to the agent failed with error: generatecommitmessageagent execute with responses API failed: model gpt-5-mini is not supported via Responses API. not found: model "gpt-5-mini" is not supported via Responses API

Screenshots

Additional context

No response

[pol-rivero]

Just as a quick check, could you try logging out of your GitHub accounts in the app and logging back in?

[Jdyn]

Wait what, I had done this previously and it didn't work, but it just worked. One thing I noticed is that the sign-in integration screen showed the official Github desktop app, where as when I first installed this tool, it showed your username / app authorization.

Did the integration recently change?

[moxie-coder]

I’m also having this issue and I’ve relogged a few times and no luck

[pol-rivero]

@Jdyn yes, that's normal, the integration changed some time ago.

@moxie-coder That's strange, is your error message identical (not found: model "gpt-5-mini" is not supported via Responses API)? Or is it something different?
Also, could you check if it works in upstream GitHub Desktop with the same GitHub account?