Add Fable 5 model to Studio Code agent - #3747
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Registers claude-fable-5 (Anthropic family) in the central AI model registry so it appears in the Studio Code agent's model picker. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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## Related issues - Related to #3747 ## How AI was used in this PR Authored with Claude Code. It located the affected commits in #3747, reverted the model registry entry, restored the previous default model and the Opus 4.7 entry, and verified the change with eslint and the TypeScript type checker. The author reviewed the change. ## Proposed Changes Reverts the changes from #3747. Fable 5 is no longer available, so removing it prevents users from selecting a model that will fail at request time. This restores the model picker to its prior state: - Removes the **Fable 5** option from the Studio Code agent model picker. - Restores the default model to **Sonnet 4.6** (it had been switched to Fable 5). - Restores the **Opus 4.7** option that #3747 had removed. ## Testing Instructions - Open the Studio Code agent chat composer and confirm **Fable 5** no longer appears in the model picker, and **Opus 4.7** is present again. - Confirm new sessions default to **Sonnet 4.6**. - `npm run typecheck` passes. ## Pre-merge Checklist - [x] Have you checked for TypeScript, React or other console errors? Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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## Related issues - Related to #3747 ## How AI was used in this PR Authored with Claude Code. It located the affected commits in #3747, reverted the model registry entry, restored the previous default model and the Opus 4.7 entry, and verified the change with eslint and the TypeScript type checker. The author reviewed the change. ## Proposed Changes Reverts the changes from #3747. Fable 5 is no longer available, so removing it prevents users from selecting a model that will fail at request time. This restores the model picker to its prior state: - Removes the **Fable 5** option from the Studio Code agent model picker. - Restores the default model to **Sonnet 4.6** (it had been switched to Fable 5). - Restores the **Opus 4.7** option that #3747 had removed. ## Testing Instructions - Open the Studio Code agent chat composer and confirm **Fable 5** no longer appears in the model picker, and **Opus 4.7** is present again. - Confirm new sessions default to **Sonnet 4.6**. - `npm run typecheck` passes. ## Pre-merge Checklist - [x] Have you checked for TypeScript, React or other console errors? Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Related issues
How AI was used in this PR
Authored with Claude Code. I located the central model registry, added the new entry, and verified the change with eslint and the TypeScript type checker. The author reviewed the change.
Proposed Changes
Enables the Fable 5 model in the Studio Code agent. It now appears as a selectable option in the chat model picker alongside the existing Anthropic and OpenAI models. Because the model registry is centralized, this single registry entry propagates automatically to the model picker, provider availability lists, the agent runtime (served via the Anthropic-messages path with reasoning enabled), and session model persistence/validation.
It is not the default model — users opt into it via the picker.
Testing Instructions
npm run typecheckpasses.Pre-merge Checklist