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Anthropic · AIJan 23, 2026, 05:09 UTC 9 months ago

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

MinorNot disclosedUpdated 47d ago
Jan 23, 05:09 UTCJan 23, 07:47 UTC
Duration
2h 38m
Impact
Minor
Root cause
Not disclosed
Anthropic, 90 days
49 incidents
Affected
Not listed by the vendor.
Status page

Final update

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.

Timeline

  1. Resolved · Jan 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.

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Full history