19-min outage on Sonnet 5 resolved. Production users should check error logs
Claude Sonnet 5 experiences elevated error rates, incident resolved
Original: Elevated errors for Claude Sonnet 5
Importance: 本番 API の一時的な障害で、既存実装ユーザーに直接影響を与えるため緊急度は高いが、短時間で復旧完了したため 5 には至らず
Summary
On September 3, Anthropic experienced elevated error rates for Claude Sonnet 5 API requests. Investigation began at 12:37 UTC, a fix was implemented by 12:47 UTC, and the incident was fully resolved by 12:56 UTC. No details on the root cause or scale of impact were disclosed, though Anthropic's rapid response suggests swift remediation.
Key Points
- Elevated errors on Claude Sonnet 5 API detected on Sep 3
- Response to resolution took ~19 minutes from detection
- Root cause and fix details not disclosed
- Now resolved and under monitoring
View developer notes (APIs, breaking changes, migration)
Claude Sonnet 5 API endpoints experienced production errors with elevated failure rates. Anthropic's status page does not disclose specific error rates, affected regions/user cohorts, or root cause (infrastructure/code/load balancer). The fix was implemented and monitoring completed in ~9 minutes. Applications running Claude Sonnet 5 in production should review error logs from this window and validate retry logic.
Source: https://status.claude.com/incidents/288w7p4hk1l1
Outlet: Anthropic Status
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