9-minute error window on Mythos & Fable; fix deployed, details pending
Elevated Errors for Claude Mythos 5.1 and Claude Fable 5.1 — Fixed
Original: Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1
Importance: 本番環境で複数モデルの同時エラー発生、迅速な修正も確認中段階のため多くのAPIユーザーに実装面の確認を促す
Summary
Anthropic experienced elevated error rates on Claude Mythos 5.1 and Claude Fable 5.1 starting Sep 11 at 14:19 UTC. The cause was identified by 14:21 UTC, and a fix was deployed by 14:28 UTC with ongoing monitoring. The incident lasted approximately 9 minutes. No details on root cause or scope of impact were provided in the status update.
Key Points
- Error surge on Mythos 5.1 & Fable 5.1 starting 14:19 UTC
- Fix deployed by 14:28 UTC with monitoring ongoing
- ~9-minute incident window with real-time status updates
- Root cause identified but details not yet published
- Developers advised to verify retry behavior and error codes
View developer notes (APIs, breaking changes, migration)
API requests to Claude Mythos 5.1 and Claude Fable 5.1 experienced elevated error rates from 14:19–14:28 UTC on Sep 11. No breakdown of error codes (4XX vs 5XX), rate-limiting specifics, or timeout patterns provided. Root cause details and recommended retry strategies not disclosed in status update. Developers should verify exact error responses via logs and consider implementing exponential backoff or circuit breaker patterns for these models. Full incident report expected on post-mortem.
Source: https://status.claude.com/incidents/t33dncr5ydvl
Outlet: Anthropic Status
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