Elevated error rates on Claude Opus and Sonnet 4.6

Update timeline

1. investigating Mar 21, 2026, 12:07 AM UTC

   We are currently investigating elevated error rates affecting Claude Opus 4.6. Our team is actively working to identify the root cause.

2. identified Mar 21, 2026, 12:17 AM UTC

   We have identified an issue resulting in elevated errors on both Claude Opus and Sonnet 4.6, and are working to resolve this issue as quickly as possible.

3. identified Mar 21, 2026, 12:58 AM UTC

   We have observed success rates return to normal for Claude Opus 4.6, and are working to fully resolve elevated errors for Claude Sonnet 4.6.

4. resolved Mar 21, 2026, 01:42 AM UTC

   This incident has been resolved.