Anthropic: Elevated errors for multiple models

Anthropic · anthropic.comImpact: majorResolved2026-09-03 16:23 UTC

Public — what happened

Summary

The issue affecting Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 has been resolved. Impact has ended as of 9:16 PT / 16:16 UTC.

Timeline

Started — 2026-09-03 13:26 UTC
Last update — 2026-09-03 16:23 UTC
Resolved — 2026-09-03 16:23 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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Customers get the live Provider Assessment Report for Anthropic: paths off baseline right now, where on the route conditions change, and its full incident track record.

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