Sonnet 4.6 down for ~40 min early morning UTC. Retry logic remains critical.
Elevated errors on Sonnet 4.6 — incident resolved
Original: Elevated errors on Sonnet 4.6
Importance: 本番APIの広範囲な障害であり、Sonnet 4.6を使用中のユーザーに直接的な影響が生じた
Summary
Anthropic experienced elevated error rates on Sonnet 4.6 on April 24. The incident was reported at 02:55 UTC, identified at 03:09 UTC, and a fix was implemented by 03:15 UTC. Full resolution was confirmed at 03:34 UTC, with the outage lasting approximately 40 minutes total. Updates were tracked in real-time on Anthropic's status page.
Key Points
- Sonnet 4.6 error rate spike, ~40 min outage window
- 02:55 UTC reported → 03:15 UTC fix deployed
- 03:34 UTC full resolution confirmed
- Real-time status updates throughout incident
View developer notes (APIs, breaking changes, migration)
Sonnet 4.6 API endpoint experienced elevated error rates for approximately 40 minutes on April 24. Specific error messages, root cause details, and affected request percentages are not disclosed in the status update, but Anthropic's engineering team identified the issue and deployed a fix by 03:15 UTC. Developers running Sonnet 4.6 in production during this window may have experienced increased request failure rates. Review of error handling and retry logic is recommended.
Source: https://status.claude.com/incidents/wlysnq540b32
Outlet: Anthropic Status
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