Revert Fable 5 model from Studio Code agent - #3827
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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
epeicher
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Jun 15, 2026
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Thanks @wojtekn for reverting this, as Fable is no longer available! I have tested starting a new session and resuming an existing Fable session, and both work as expected. They select the default model. Changes LGTM!
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As next iteration, we could consider creating an endpoint to load the valid models. 🤔 |
youknowriad
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Jun 15, 2026
| // reasoning turns. | ||
| export const AI_MODELS = [ | ||
| { id: 'claude-sonnet-4-6', label: 'Sonnet 4.6', family: 'anthropic' }, | ||
| { id: 'claude-opus-4-7', label: 'Opus 4.7', family: 'anthropic' }, |
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I think it's fine to leave this one out
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I see that now, I will remove in follow-up.
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📊 Performance Test ResultsComparing 8da2417 vs trunk app-size
site-editor
site-startup
Results are median values from multiple test runs. Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff) |
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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. 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:
Testing Instructions
npm run typecheckpasses.Pre-merge Checklist