Live / Incidents / Anthropic

Anthropic: Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

Anthropic · anthropic.comImpact: majorResolved2026-09-11 14:37 UTC

Public — what happened

Summary

The issue affecting Claude services has been resolved. Impact occurred from 13:57 to 14:20 UTC

Timeline

Started — 2026-09-11 14:19 UTC
Last update — 2026-09-11 14:37 UTC
Resolved — 2026-09-11 14:37 UTC

Source of record: provider status page. Mirrored as reported; times in UTC.

With SquidGrid — where it starts on the route

Independent path health

The status page is the symptom. SquidGrid measures the paths that reach Anthropic against their own baselines — whether the routes carrying your traffic degraded, at which handoff, and who owns that stretch.

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Related: Anthropic status & history. SquidGrid is not affiliated with Anthropic.