Title: Copilot cloud agent job fails with Model "gpt-5.3-codex" is not available (auto-selected model, worked last week)

[anondev-sudo]

🏷️ Discussion Type

Question

💬 Feature/Topic Area

Copilot Agent Mode

Body

Hi GitHub team,

I’m seeing a failure in a Copilot cloud agent job where I did not manually choose a model (it was auto-selected by GitHub Copilot Chat).

What happened
My Actions job fails during session.create with:

Request session.create failed with message: Model "gpt-5.3-codex" is not available.
[runtime:-32603] Copilot has encountered an unexpected error ... Model "gpt-5.3-codex" is not available.

This worked about 1 week ago with the same general setup.
I’m on the GitHub Student Developer Pack.
Repo: anondev-sudo/chargelimes
Workflow run URL: https://github.com/anondev-sudo/chargelimes/actions/runs/28245359774/job/83682772056
Workflow shown in logs: Copilot cloud agent
Job ID: 83682772056
Run ID: 28245359774
Relevant log excerpt
[cca-engine] Error: Error: Request session.create failed with message: Model "gpt-5.3-codex" is not available.

Could you confirm:

Whether gpt-5.3-codex was recently removed/disabled for my plan or org,
Why auto-selection is choosing an unavailable model,
What model(s) I should pin/use for Copilot cloud agent jobs under Student Developer Pack,
Whether this is a known incident/regression.

Thanks!

[zhimin-z]

any update?

[evokerking1]

Same here was working 20 hours ago and then just stopped

[evokerking1]

Update: Tried it from a copilot cli, gpt-5.3-codex is available through that so must be some sort of issue in cloud agents implementation