Mythos and Fable 5.1 down. Production teams should prepare fallback routing now.
Intermittent error spikes reported for Claude Mythos 5.1 and Claude Fable 5.1
Original: Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1
Importance: 本番APIの複数モデルで即座にエラー増加が発生しており、既存ユーザーサービスに直接影響
Summary
Anthropic is investigating elevated error rates on requests to Claude Mythos 5.1 and Claude Fable 5.1 as of September 15. Initial investigation began at 09:48 UTC with an update at 09:52 UTC. The company states it will provide further updates as soon as possible.
Key Points
- Error spikes confirmed on Mythos 5.1 and Fable 5.1
- Investigation started at 09:48 UTC, updated at 09:52 UTC
- Ongoing tracking via official status page
- No ETA for resolution announced yet
View developer notes (APIs, breaking changes, migration)
Production incident affecting Claude Mythos 5.1 and Claude Fable 5.1 API endpoints with elevated error rates. Incident tracked at status.claude.com (ID: 6304r9jjhj34). Developers should consider fallback strategies using alternative model routing (e.g., Claude 3.5 Sonnet) and strengthen retry logic. ETA for resolution not yet provided.
Source: https://status.claude.com/incidents/6304r9jjhj34
Outlet: Anthropic Status
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