Opus 5 incident ongoing—production teams should prepare model fallback now
Elevated errors on Claude Opus 5 — investigating
Original: Elevated errors on Claude Opus 5
Importance: 本番稼働するClaudeユーザーに即時影響。エラー率上昇は応答失敗やタイムアウトをもたらす。
Summary
Anthropic detected elevated error rates on Claude Opus 5 as of July 27, 13:39 UTC. The status page shows multiple investigation updates between 13:39–13:42 UTC, indicating ongoing incident response. Root cause and scope remain undisclosed, but users may experience delayed responses or failed requests.
Key Points
- Elevated error rate detected on Claude Opus 5 (Jul 27, 13:39 UTC)
- Anthropic investigating; root cause undisclosed
- API users should verify retry logic and prepare fallback models
- Status page updates ongoing
- ETA for resolution not yet announced
View developer notes (APIs, breaking changes, migration)
Claude Opus 5 endpoints are experiencing elevated errors as of 2026-07-27T13:42 UTC. Developers should review retry logic (exponential backoff) and prepare model fallbacks (Opus 4, Sonnet 3.7). Response latencies may increase; rate-limit thresholds could be exceeded during the incident. For production-dependent workloads, subscribe to status.claude.com notifications or integrate API health checks.
Source: https://status.claude.com/incidents/rkk5x44tndw9
Outlet: Anthropic Status
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