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Github Copilot GPT 5.3 Codex - Requested Model is not supported - (model works in VS Code). #13313
Closed as duplicate
Description
Description
Unable to use github-copilot/gpt-5.3-codex model - opencode reports "The requested model is not supported."
Previous guidance was to check that the model was enabled.. But Github have removed the ability to manually enable/disable models that used to be available on the Features page. All models are now enabled by default.
Confirmed that GPT 5.3 Codex works from inside Visual Studio Code.
Plugins
OhMyOpenCode 3.5.2
OpenCode version
1.1.60
Steps to reproduce
Run opencode
Select github-copilot/gpt-5.3-codex
Send message
Receive error
Screenshot and/or share link
Operating System
Windows 11 25H2 // WSL 2.6.3.0 // Ubuntu 24.04.3 LTS (Noble Numbat)
Terminal
Windows Terminal 1.23.20211.0
Reacted by Pereg Hergoualc'h, Martin, Davide Santangelo and Kareem Elbahrawy
Activity
github-actions commentedon Feb 12, 2026
This issue appears to be a duplicate of #13312: "Codex 5.3 not working with copilot". Both report the same "model is not supported" error with the github-copilot/gpt-5.3-codex model.
Please check #13312 to see if your issue has already been addressed or if there are any workarounds available.
rekram1-node commentedon Feb 20, 2026
Yeah It's not supported in opencode yet, it hasn't been fully rolled out.
It should roll out soon.
You may ask well I can use it in github copilot cli but not opencode why is that?
This is because WE have a separate client id than the official copilot cli, so they havent rolled it out to all clients quite yet.
grahamcropley commentedon Feb 20, 2026
I appreciate the update, thank you for taking the time to respond. Cheers.
jomach commentedon Feb 27, 2026
install opencode -> /connect -> Github Copilot -> /models -> GPT-5.2-Codex