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All agents  /  Claude API  /  History  /  Oct 5, 2026

Claude API outage on Oct 5, 2026: elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

Resolved after 16 min.

13:05 UTC to 13:21 UTC your time. Anthropic: “Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1.” 0 reports here during the incident.

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Reports during the incident

Every 15 minutes, 12:00 UTC to 14:30 UTC. Grey: normal. Red line: official incident.
12:00 UTC13:05 UTC13:21 UTC14:30 UTC

What people reported

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Anthropic's updates

Quoted from status.claude.com

  1. 13:05 UTC

    Investigating

    We are investigating elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1. We will provide an update as soon as possible.

  2. 13:21 UTC

    Resolved

    The issue affecting Claude Mythos 5.1 and Claude Fable 5.1 has been resolved. Impact occurred from 05:40 PT / 12:40 UTC to 06:10 PT / 13:10 UTC.

Other Claude API incidents

Nov 826 minDegraded performance for Claude Fable 5.1Details
Oct 2741 minElevated errors for Claude Sonnet 5.5Details
Oct 2742 minElevated errors for Claude Sonnet 5.5Details
All Claude API incidents

Other agents

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