Multiple Claude models down with elevated errors. Prod teams should heighten monitoring now.
Degraded performance affecting multiple Claude models under investigation
Original: Degraded performance for multiple models
Importance: 本番環境の Claude API ユーザーが即影響を受ける可能性のある現在進行形の障害
Summary
Anthropic reported on Aug 18 at 16:20 UTC elevated error rates and degraded performance affecting Claude Mythos 5, Claude Fable 5, Claude Opus 5, Claude Sonnet 5, Claude Haiku 4.5, and other Claude models. The company is investigating the incident and will provide updates as available.
Key Points
- Multiple models showing elevated API error rates, investigation ongoing
- Affects Mythos 5, Fable 5, Opus 5 and other core models
- Further details forthcoming; root cause not yet identified
View developer notes (APIs, breaking changes, migration)
Multiple Claude model endpoints (Mythos 5, Fable 5, Opus 5, Sonnet 5, Haiku 4.5 and others) experiencing elevated error rates on API requests. Root cause under investigation; technical details (backend processing, tokenization, inference engine, load balancing) not yet disclosed. API integrators should verify retry logic, expect increased rate limit / timeout errors, and review alert thresholds.
Source: https://status.claude.com/incidents/q7txxvbsftgq
Outlet: Anthropic Status
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