Multiple models reporting elevated errors; Sonnet 5.5 root cause found. Continuous monitoring of fix progress required.
Elevated errors across multiple Claude models including Sonnet 5.5
Original: Elevated errors for Claude Sonnet 5.5
Importance: 本番環境のAPIリクエスト障害であり、既存ユーザーに直接影響を与える緊急事態
Summary
Anthropic's status page reports elevated error rates on requests to Claude Sonnet 5.5, Opus 5.5, Haiku 5.5, Mythos 5.1, and Fable 5.1. Investigation began at 06:14 UTC on October 25, with the root cause of Sonnet 5.5 errors identified by 06:27 UTC. A fix is in progress. Detailed error descriptions, scope of impact, and ETA for resolution are not yet disclosed.
Key Points
- Elevated error rates on Sonnet 5.5 and other models confirmed
- Sonnet 5.5 root cause identified as of 06:27 UTC; fix in progress
- Other models under investigation; details undisclosed
- Ongoing monitoring recommended via status page
View developer notes (APIs, breaking changes, migration)
Multiple Claude model families (Sonnet, Opus, Haiku 5.x; Mythos 5.1, Fable 5.1) are experiencing elevated API request error rates. Investigation began at 06:14 UTC; Sonnet 5.5 root cause identified and fix in progress as of 06:27 UTC. Nature of failure (backend outage, rate-limiting, model server capacity), HTTP status codes, and Anthropic Failure Reason headers remain undisclosed. Production users should reinforce retry logic and validate fallback strategies. Progress tracked at status.claude.com/incidents/334jvgbrc4ff.
Source: https://status.claude.com/incidents/334jvgbrc4ff
Outlet: Anthropic Status
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