4 models hit simultaneously — fix in progress. API users should verify retry logic.
Elevated errors for Mythos 5, Fable 5, Opus 5, and Haiku 4.5 — Fix being implemented
Original: Elevated errors for Mythos 5, Fable 5, Opus 5 and Claude Haiku 4.5
Importance: 本番環境の API リクエストが影響を受ける障害であり、既存ユーザーに直結する可用性問題
Summary
Anthropic reported elevated error rates affecting Claude Mythos 5, Fable 5, Opus 5, and Haiku 4.5 on July 25 at 18:40 UTC. By 18:44 UTC, the issue was identified and a fix is being implemented. Multiple model lines are impacted simultaneously, potentially affecting production environments for API users.
Key Points
- Simultaneous error rate spike across Mythos 5, Fable 5, Opus 5, Haiku 4.5
- Reported 18:40 UTC, root cause identified 18:44 UTC, fix in progress
- Elevated errors on API requests affecting production users
- Status page lacks specific error codes and scope details
View developer notes (APIs, breaking changes, migration)
Error rate spike affecting multiple Claude model versions (Mythos 5, Fable 5, Opus 5, Haiku 4.5) on the Messages API endpoint. Root cause identified; fix implementation underway. Specific HTTP status codes, geographic scope, and backend component not disclosed on Status page. Production API consumers should verify retry logic and circuit breaker behavior. Estimated time to resolution not provided.
Source: https://status.claude.com/incidents/f1q2wvw4qj4j
Outlet: Anthropic Status
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