Opus 5 down — production users should review Sonnet failover options now
Anthropic investigating elevated errors on Claude Opus 5
Original: Degraded performance for Claude Opus 5
Importance: 本番環境のAPI呼び出しが失敗するため、既存ユーザーに直接的な影響を及ぼしています。
Summary
Anthropic reported elevated error rates on Claude Opus 5 requests as of August 17, 2026. The company posted an investigation notice on its status page, pledging updates shortly. No root cause, scope, or ETA has been disclosed yet. Users relying on Opus 5 in production may need contingency plans pending resolution.
Key Points
- Claude Opus 5 experiencing elevated error rates; Anthropic investigating
- No ETA or root cause disclosed yet
- Production users should consider immediate failover to alternative models
- Updates will be posted on status page
View developer notes (APIs, breaking changes, migration)
Claude Opus 5 API endpoints are experiencing elevated error rates; Anthropic's official status page flags active investigation. Affected scope (specific region, model version, request type) remains undisclosed. Production deployments should implement immediate failover to Opus 3.5 Sonnet or strengthen exponential backoff retry logic. Review Anthropic API documentation for Opus 5 model IDs and endpoint details; enhance error logging in your client code to capture failure patterns.
Source: https://status.claude.com/incidents/zhk4v3yv1lsf
Outlet: Anthropic Status
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