30-min incident on Mythos & Fable models. Production users should review logs for that window.
Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1 — now resolved
Original: Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1
Importance: 本番運用中のエンドユーザーが影響を受けた可能性があり、API の信頼性に関わる項目
Summary
Anthropic reported elevated error rates on API requests to Claude Mythos 5.1 and Claude Fable 5.1 on October 5. The incident occurred from 05:40 to 06:10 PT (12:40–13:10 UTC) and has been resolved. The company provided no details on root cause or scope of impact. Users querying these models during the window may have experienced request failures.
Key Points
- Error surge on Mythos 5.1 and Fable 5.1 confirmed
- Incident window ~30 min (UTC 12:40–13:10)
- Now resolved; root cause not disclosed
- API calls to affected models temporarily failed
- Reported on status page; detailed RCA pending
View developer notes (APIs, breaking changes, migration)
API requests to Claude Mythos 5.1 and Claude Fable 5.1 experienced elevated error rates between 05:40–06:10 PT (UTC 12:40–13:10). The status page does not specify error codes, root cause, affected endpoints (e.g., /v1/messages), or recovery steps. Developers should review retry logic and timeout thresholds for critical workloads during incident windows. Awaiting Anthropic's detailed post-incident RCA.
Source: https://status.claude.com/incidents/bhphxz3vr58g
Outlet: Anthropic Status
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