# Claude: Elevated errors: Invalid `signature` in `thinking` block

> Claude status incident “Elevated errors: Invalid `signature` in `thinking` block” on 2026-01-23: impact minor (vendor’s label), 2.6 h, 1 update(s). Archived by Rewindex.

Canonical: https://rewindex.com/company/claude/incidents/5dvcj03m4d57
Last updated: 2026-01-23T07:47:00Z

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2026-01-23 05:09 UTC · Resolved: 2026-01-23 07:47 UTC · Duration: 2.6 h
- Updates: 1
- [Vendor status page: https://status.claude.com/incidents/5dvcj03m4d57](https://status.claude.com/incidents/5dvcj03m4d57)
- [Company: Claude](https://rewindex.com/company/claude.md)

## Timeline of updates

- **resolved** 2026-01-23 07:47 UTC: This issue is resolved for new requests. However, for responses from one platform received between 2026-01-23 00:00 UTC - 2026-01-23 08:00 UTC that are subsequently included in requests sent to a different platform, there may still be errors.

_From the vendor’s published history: only the final update text is available for incidents before Rewindex began polling this page._

## Cite this

Status incident (vendor impact label: minor) posted by Claude, started 2026-01-23 05:09 UTC, resolved after 2.6 h, 1 update(s).

- Canonical URL: https://rewindex.com/company/claude/incidents/5dvcj03m4d57
- Citation: Claude, “Elevated errors: Invalid `signature` in `thinking` block” (2026-01-23 05:09 UTC). Archived by Rewindex: https://rewindex.com/company/claude/incidents/5dvcj03m4d57 (CC BY 4.0).
- Markdown link: `[Claude: Elevated errors: Invalid `signature` in `thinking` block (2026-01-23)](https://rewindex.com/company/claude/incidents/5dvcj03m4d57)`


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Canonical: https://rewindex.com/company/claude/incidents/5dvcj03m4d57 · Markdown: https://rewindex.com/company/claude/incidents/5dvcj03m4d57.md · JSON: https://rewindex.com/api/v1/companies/claude/incidents/5dvcj03m4d57 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T18:02:53.605Z