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Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1

Claude Status · incident · Sep 15, 2026 · UTC

major

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recordType
outage
status
resolved
evidenceStatus
provider-reported
region
Global

Reported occurrence date: 2026-09-15T09:48:23.066Z

Evidence & attribution

First collected: 2026-09-19T20:26:32.566Z. This is not the publication date.