Sonnet 4.5 down for 1+ hour — no root cause or mitigation details shared
Claude Sonnet 4.5 error spike resolved
Original: Claude Sonnet 4.5 error spike
Importance: 本番環境での API 障害。ユーザーの処理継続性と信頼性に直結
Summary
Anthropic reported an error spike affecting Claude Sonnet 4.5 on April 20. The incident was detected at 06:14 UTC, with investigation underway. A fix was deployed at 06:38 UTC, and the company continued monitoring for further issues. The incident was fully resolved by 07:25 UTC. No detailed root cause or impact scope has been disclosed, though the incident duration of over an hour suggests potential service disruption for users.
Key Points
- Error spike detected on Sonnet 4.5 at 06:14 UTC
- Fix deployed at 06:38 UTC, over 1 hour total response time
- Full resolution reported at 07:25 UTC on April 20
- Root cause and scope remain undisclosed
View developer notes (APIs, breaking changes, migration)
Claude Sonnet 4.5 API experienced an error spike with ~24 minutes between detection (06:14 UTC) and fix deployment (06:38 UTC). Status page lacks specifics on error codes, affected endpoints, request patterns, or token consumption during the incident. Developers running Sonnet 4.5 in production should enable enhanced error logging, review retry policies, and implement circuit breakers. No breaking changes or version migrations are indicated; standard incident recovery practices apply.
Source: https://status.claude.com/incidents/8rg3l7v56ngc
Outlet: Anthropic Status
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