Anthropic incident

Elevated error rates on Claude Opus and Sonnet 4.6

Resolved after 1 hour 35 minutes, affecting claude.ai and Claude Console (platform.claude.com) and 1 more, on March 21, 2026.

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.

Started: Mar 21, 2026, 12:07 AM UTC
Resolved: Mar 21, 2026, 01:42 AM UTC
Duration: 1h 35m
Detected by Pingoru: Mar 21, 2026, 12:07 AM UTC

Affected components

claude.aiClaude Console (platform.claude.com)Claude API (api.anthropic.com)Claude Code

Update timeline

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

This incident has been resolved.

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