Opus 5.5 spiked errors for 11 mins. Limited blast radius, but retry logic would've made the difference
Elevated errors for Claude Opus 5.5 — incident resolved
Original: Elevated errors for Claude Opus 5.5
Importance: 本番APIの障害であり、既存ユーザーの実行中アプリケーションに直接影響した可能性がある
Summary
Anthropic reported elevated error rates affecting Claude Opus 5.5 API requests. The incident lasted approximately 11 minutes from 17:23 PT October 23 to 17:34 PT October 23 (00:23–00:34 UTC October 24), impacting users making requests to the model. The issue has been resolved.
Key Points
- Claude Opus 5.5 API error rate elevation
- Incident duration: ~11 minutes
- Recovery confirmed at 2026-10-24 00:34 UTC
- Root cause details not disclosed
View developer notes (APIs, breaking changes, migration)
Claude Opus 5.5 API encountered elevated error rates for ~11 minutes. The specific HTTP status codes and error details were not disclosed in the status report. Production API calls (likely v1/messages, v1/completions endpoints) may have experienced failures during the window. Recovery confirmed at 2026-10-24T00:34:00Z. No details on error budget impact, rate limiting changes, or mitigation steps provided.
Source: https://status.claude.com/incidents/3cqf3pmlnr96
Outlet: Anthropic Status
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