GitHub Copilot models are unusable despite active subscription, enabled settings, and available quota

[FoXiBoy]

Description

I cannot use any models through the GitHub Copilot provider in OpenCode. GPT and Claude models return The requested model is not supported. Gemini also does not work correctly and returns abnormal output instead of a normal usable response. I have already tried re-authenticating with GitHub OAuth, logging in again from scratch, and confirming that all Copilot-related settings are enabled. My Copilot subscription is active and I still have available premium requests, so this does not appear to be a quota issue.

Plugins

none

OpenCode version

OpenCode Desktop v1.3.13

Steps to reproduce

1. Sign in to GitHub Copilot in OpenCode
2. Re-authenticate with GitHub OAuth
3. Confirm Copilot is active, all Copilot settings are enabled, and premium requests are still available
4. Select any GitHub Copilot model in OpenCode
5. Send a simple prompt
6. Observe that GPT and Claude models return The requested model is not supported, while Gemini does not return a normal usable response

Screenshot and/or share link

No response

Operating System

Windows 11

Terminal

OpenCode Desktop

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• The requested model is not supported. #12789: Same error message "The requested model is not supported." with GitHub Copilot
• "The requested model is not supported." while using gemini3pro in Github Copilot #8829: Same error with Gemini via GitHub Copilot specifically
• GitHub Copilot preview models rejected — auth plugin sends raw OAuth token instead of exchanging for Copilot session token #19338: GitHub Copilot auth/token issues causing model rejections
• Copilot Business/Enterprise users can't use OpenCode — three compounding auth/endpoint/header issues #20759: Broader GitHub Copilot connectivity and auth issues

Please review those issues and add any additional context there if they match your situation.

[FoXiBoy]

I reviewed the related issues suggested by the bot, but I could not find a clear workaround that resolves this problem.

My case also appears broader than the linked issues. It is not limited to a single model:

• GPT models return The requested model is not supported
• Claude models return The requested model is not supported
• Gemini also fails and does not return a normal usable response

I already re-authenticated with GitHub OAuth, verified that my Copilot subscription is active, verified that all Copilot settings are enabled, and confirmed that premium requests are still available.

Because of that, this does not appear to be caused by quota exhaustion or a simple authentication mistake on my side.