Summary

The Copilot provider's model list in src/providers/github-copilot-models.ts is outdated and missing recent models including claude-opus-4-6-fast and gpt-5.3-codex. Trying to use these models through OpenClaw results in errors:

Error: Unknown model: github-copilot/claude-opus-4-6-fast

Error: Unknown model: github-copilot/gpt-5-3-codex

There is also an opportunity to modernize the full model list to reflect the actual options available via GitHub Copilot (based on recent Copilot CLI and proxy plugin changes).

Proposed solution

Update src/providers/github-copilot-models.ts to add claude-opus-4-6-fast and gpt-5.3-codex to the DEFAULT_MODEL_IDS array and refresh the list to include current supported models:

• gpt-5.3-codex
• gpt-5.2
• gpt-5.2-codex
• gpt-5.1
• gpt-5.1-codex
• gpt-5.1-codex-max
• gpt-5-mini
• claude-opus-4.6
• claude-opus-4-6-fast (new — Preview)
• claude-opus-4.5
• claude-sonnet-4.5
• claude-haiku-4.5
• gemini-3-pro
• gemini-3-flash
• grok-code-fast-1

This should unblock access to these models and keep OpenClaw Copilot support in sync with Copilot CLI and Copilot Proxy capabilities.

Alternatives considered

Attempted manual config changes to register the models as custom provider entries in models.providers, but this conflicts with Copilot's authentication/token exchange mechanism (the codebase intentionally avoids defining custom models for the Copilot provider to prevent apiKey requirement issues).

Additional context

• https://github.blog/changelog/2026-02-07-claude-opus-4-6-fast-is-now-in-public-preview-for-github-copilot/
• GPT-5.3-Codex is now generally available for GitHub Copilot
• extensions/copilot-proxy/index.ts has a more up-to-date model list for reference
• Current DEFAULT_MODEL_IDS still references gpt-4o, o1, o1-mini, o3-mini