## 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>
## Thinking Path
> - Paperclip orchestrates AI-agent companies through adapter-backed
local and external runtimes.
> - The agent configuration UI lets operators choose adapter models and
refresh model lists when adapters support live discovery.
> - Codex already had a live refresh path, but Claude Local only exposed
static fallback models and the UI hid the refresh action for Claude.
> - A newly available Claude Opus model should not require a code
release every time the model catalog changes.
> - This pull request adds Anthropic model discovery for Claude Local,
keeps the static fallback current with Claude Opus 4.8, and exposes the
existing refresh button in the Claude Local dropdown.
> - The benefit is that operators can refresh Claude models from the
same model selector flow they already use for Codex.
## What Changed
- Added `claude-opus-4-8` to the Claude Local fallback model list.
- Added Claude model discovery through Anthropic-compatible `GET
/v1/models` when `ANTHROPIC_API_KEY` is available.
- Added normal cache reuse, forced refresh support, a SHA-256-based
API-key fingerprint for cache keys, and warning logging for discovery
errors before fallback.
- Wired `claude_local.refreshModels` into the server adapter registry.
- Enabled the existing `Refresh models` dropdown action for
`claude_local` in `AgentConfigForm`.
- Added tests for Claude fallback, live discovery, API-failure fallback,
forced refresh, and the UI refresh-button gate.
## Verification
- `pnpm exec vitest run server/src/__tests__/adapter-models.test.ts`
- `pnpm exec vitest run ui/src/components/AgentConfigForm.test.ts`
- `pnpm --filter @paperclipai/adapter-claude-local typecheck`
- `pnpm --filter @paperclipai/server typecheck`
- `pnpm --filter @paperclipai/ui typecheck`
- Greptile review reached Confidence Score: 5/5 on commit `b796cf4f1`
with addressed threads resolved.
UI note: the visible change is a conditional action row inside the
existing model dropdown; the regression test covers that `claude_local`
now receives the refresh action.
## Risks
- Low risk. Without `ANTHROPIC_API_KEY`, Claude Local still uses the
static fallback list.
- If Anthropic model discovery fails or times out, Paperclip falls back
to the existing cached or static list.
- Bedrock environments remain on Bedrock-native model IDs.
## Model Used
OpenAI GPT-5 via Codex local coding agent, with repository file access,
shell command execution, git operations, and targeted test/typecheck
verification. Exact context window is not exposed by the runtime.
## Checklist
- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] If this change affects the UI, I have included before/after
screenshots
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] I will address all Greptile and reviewer comments before
requesting merge
- Import models from index.ts instead of duplicating the array
- Use regex ^\w+\.anthropic\. to match all Bedrock region prefixes
(us, eu, ap, and any future regions)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Previously, --model was completely skipped for Bedrock users, so the
model dropdown selection was silently ignored and the CLI always used
its default model. Selecting Haiku would still run Opus.
- Add listClaudeModels() that returns Bedrock-native model IDs
(us.anthropic.*) when Bedrock env is detected
- Register listModels on claude_local adapter so the UI dropdown
shows Bedrock models instead of Anthropic API names
- Allow --model to pass through when the ID is a Bedrock-native
identifier (us.anthropic.* or ARN)
- Add isBedrockModelId() helper shared by execute.ts and test.ts
Follows up on #2793 which added basic Bedrock auth detection.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Dotta