fix(anthropic): remove stale effort-2025-11-24 beta header#14989
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lgrammel merged 3 commits intoMay 5, 2026
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@Mmartinrusso thanks. please keep our pr description structure, add a patch changeset, and sign the commits. you can find more information here: https://github.com/vercel/ai/blob/main/CONTRIBUTING.md#submitting-pull-requests |
The effort parameter went GA on 2025-11-24, requiring only the
output_config.effort body field. The anthropic-beta header is now
obsolete and is rejected by Vertex AI's strict validator with 400.
Removes the betas.add('effort-2025-11-24') call, mirroring the
precedent set by vercel#14542 (fine-grained-tool-streaming header removal).
The body-field path already drives the feature end-to-end.
Fixes vercel#14766
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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## Background
The `effort` parameter for extended thinking went GA on 2025-11-24.
Anthropic published it under a beta flag (`effort-2025-11-24`) during
the preview period, but the flag was retired when the feature shipped.
Direct Anthropic still silently ignores the stale header, but Vertex
AI's strict validator is actively rejecting requests with an HTTP 400:
```
Unexpected value(s) `effort-2025-11-24` for the `anthropic-beta` header.
```
## Summary
Remove the `betas.add('effort-2025-11-24')` call from
`anthropic-language-model.ts`. The `output_config.effort` body field
(already wired) continues to drive the feature end-to-end on direct
Anthropic, Bedrock, and Vertex.
## Manual Verification
Tested by inspecting the serialized request body in the existing test
suite - `output_config.effort` is still present and correct; the
`anthropic-beta` header no longer carries the stale value.
## Checklist
- [x] All commits are signed (PRs with unsigned commits cannot be
merged)
- [x] Tests have been added / updated (for bug fixes / features)
- [ ] Documentation has been added / updated (for bug fixes / features)
- [x] A _patch_ changeset for relevant packages has been added (for bug
fixes / features - run \`pnpm changeset\` in the project root)
- [x] I have reviewed this pull request (self-review)
## Related Issues
Fixes #14766
Similar to #14542, which removed the analogous
`fine-grained-tool-streaming-2025-05-14` header when that feature went
GA.
---------
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Lars Grammel <lars.grammel@gmail.com>
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✅ Backport PR created: #15011 |
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…15011) This is an automated backport of #14989 to the release-v6.0 branch. FYI @Mmartinrusso Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com> Co-authored-by: Lars Grammel <lars.grammel@gmail.com>
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Background
The
effortparameter for extended thinking went GA on 2025-11-24. Anthropic published it under a beta flag (effort-2025-11-24) during the preview period, but the flag was retired when the feature shipped. Direct Anthropic still silently ignores the stale header, but Vertex AI's strict validator is actively rejecting requests with an HTTP 400:Summary
Remove the
betas.add('effort-2025-11-24')call fromanthropic-language-model.ts. Theoutput_config.effortbody field (already wired) continues to drive the feature end-to-end on direct Anthropic, Bedrock, and Vertex.Manual Verification
Tested by inspecting the serialized request body in the existing test suite -
output_config.effortis still present and correct; theanthropic-betaheader no longer carries the stale value.Checklist
Related Issues
Fixes #14766
Similar to #14542, which removed the analogous
fine-grained-tool-streaming-2025-05-14header when that feature went GA.