## Summary
Adds the newly released Claude models from the [models
overview](https://platform.claude.com/docs/en/about-claude/models/overview)
to the `claude_local` adapter's model selector:
- **Claude Fable 5** (`claude-fable-5`) — generally available as of
2026-06-09, Anthropic's most capable widely-released model.
- **Claude Mythos 5** (`claude-mythos-5`) — limited availability
(Project Glasswing).
**Opus 4.8 stays first in the list so it remains the default selection**
— per the request, the new flagship models are *offered* but not
defaulted (not Fable, not Mythos).
## Changes
- `packages/adapters/claude-local/src/index.ts` — add `claude-fable-5`
and `claude-mythos-5` to the adapter model list, right after
`claude-opus-4-8`.
- `packages/adapters/claude-local/src/server/models.ts` — add the Fable
5 Bedrock identifier (`us.anthropic.claude-fable-5-v1`) to the Bedrock
fallback list. Mythos 5 is limited-availability on Bedrock, so it's
intentionally left out of that fallback.
- `server/src/__tests__/adapter-models.test.ts` — assert the new models
are present and that `claude-opus-4-8` remains first (the default).
These flow through the single `claudeModels` source, so they also appear
in the ACPX combined list (`registry.ts` prefixes them with `Claude:`)
and are recognized by the ACPX Claude model filter. The UI selector
reads models dynamically from the adapter, so no UI changes are needed.
## Testing
- `npx vitest run src/__tests__/adapter-models.test.ts` — 13 passed.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Dotta
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