Fallback model list now defaults 'ccr' and 'ccd' to claude-opus-5 instead of Sonnet 4.6 when the live catalog is unreachable
Claude Code ships a signed, static backup list of models to use if it can't fetch the live model catalog. In this release, the default model for two of the listed surfaces, 'ccr' and 'ccd', changed from claude-sonnet-4-6 to claude-opus-5. The 'cc' surface entry was already set to claude-opus-5 and is unchanged.
If Claude Code ever falls back to this offline catalog, users on the 'ccr' and 'ccd' surfaces will now get claude-opus-5 by default instead of claude-sonnet-4-6.
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
| Claude Opus 5 | `claude-opus-5` | ✓ | ✓ |build-with-claude/claude-in-microsoft-foundry see the edit
Anthropic's documentation has since written up claude-opus-5, on claude-in-microsoft-foundry.