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minor✓ Resolved

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

Anthropic (Claude)•Fri, Jan 23, 2026, 05:09 AM
Status
resolved
Duration
2h 41m
Updates
6
Coverage
0 articles

INCIDENT TIMELINE

✓ ResolvedFri, Jan 23, 2026, 07:51 AM
This incident has been resolved.
monitoringFri, Jan 23, 2026, 07:32 AM
A fix has been implemented and we are monitoring the results.
identifiedFri, Jan 23, 2026, 06:24 AM
We are continuing to work on a fix for this issue.
identifiedFri, Jan 23, 2026, 05:22 AM
A mitigation is to _not_ mix Claude API traffic between Bedrock, Vertex, and api.anthropic.com. Each platform is fully operational independently.
identifiedFri, Jan 23, 2026, 05:12 AM
We are continuing to work on a fix for this issue.
identifiedFri, Jan 23, 2026, 05:10 AM
We are continuing to work on a fix for this issue.
identifiedFri, Jan 23, 2026, 05:09 AM
The issue has been identified and fix is being implemented.

📊 TECHNICAL DETAILS

Internal ID
5f4d4459-d003-4018-b018-aeb1bd1210e3
External ID
5dvcj03m4d57
🕐 Started
Fri, Jan 23, 2026, 05:09 AM
🔄 Last Updated
Fri, Jan 23, 2026, 07:51 AM
✓ Resolved
Fri, Jan 23, 2026, 07:51 AM
MINOR
Impact Level
2h 41m
Total Duration
6
Status Updates
Affected Components
Claude API (api.anthropic.com)
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