Copilot Pro+ account: Claude models advertised but not available via Copilot API (The requested model is not supported)

[BanDaosc]

🏷️ Discussion Type

Bug

💬 Feature/Topic Area

Copilot in GitHub

Body

Hi GitHub team,
I’m on GitHub Copilot Pro+. According to the plans page:
https://docs.github.com/en/copilot/get-started/plans
Pro+ “includes … full access to all available models in Copilot Chat,” and the UI shows Claude as available for my account.
However, when I try to use Claude via the Copilot API (for example from OpenCode / other third‑party tools), I consistently get:

400 The requested model is not supported.
Concretely:

• opencode models github-copilot (or similar tooling) lists Claude models like:
  • github-copilot/claude-opus-4.6
  • github-copilot/claude-sonnet-4.6
  • github-copilot/claude-haiku-4.5
• But when I actually call them, every request fails with The requested model is not supported.
  To verify what my token can really use, I called the Copilot models API directly with my current Copilot OAuth token:
  GET https://api.githubcopilot.com/models
  Authorization: Bearer <my_copilot_token>
  The returned data[].id list includes GPT, Gemini and Grok models, for example:
• gpt-5.4, gpt-5.4-mini
• gpt-5.3-codex, gpt-5.2-codex, gpt-5.2
• gpt-5.1, gpt-5.1-codex*
• gpt-4.1, gpt-4o
• gemini-3.1-pro-preview, gemini-3-flash-preview, gemini-2.5-pro
• gpt-5-mini
• grok-code-fast-1
  But there is no claude-* entry at all in that API response (I explicitly grepped for claude and got zero matches).
  So from my side it looks like:
• The Copilot settings / UI and plans page say Pro+ includes Claude,
• but the Copilot backend API for my account’s token does not list any Claude models and rejects those model IDs with The requested model is not supported.
  I’ve seen similar reports in other projects:
• The requested model is not supported. github/copilot-cli#639
• The requested model is not supported. Make sure the model is enabled in your copilot settings: https://github.com/settings/copilot/features anomalyco/opencode#11473
• AI Chat with GitHub Copilot fails with: 400 The requested model is not supported eclipse-theia/theia-ide#675
  Questions:

1. For a Copilot Pro+ individual account, should Claude models currently appear in the https://api.githubcopilot.com/models response and be callable via the Copilot API?
2. If yes, is there a known rollout / region / account‑level gating that could explain why my token does not see any claude-* models?
3. If no (i.e. Claude is only available inside GitHub’s own Copilot Chat UI and not via the public Copilot API), could the documentation and settings UI be updated to clarify this distinction?
   Right now, third‑party tools that rely on the Copilot API see Claude listed in some menus/configs, but any actual request to those Claude model IDs fails with The requested model is not supported, which is confusing given the Pro+ marketing and settings page.
   Thanks for any clarification you can provide.

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