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All agents  /  Claude Code  /  History  /  Sep 11, 2026

Claude Code outage on Sep 11, 2026: elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

Resolved after 17 min.

14:19 UTC to 14:37 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, 13:15 UTC to 15:45 UTC. Grey: normal. Red line: official incident.
13:15 UTC14:19 UTC14:37 UTC15:45 UTC

What people reported

0 reports during the incident

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Anthropic's updates

Quoted from status.claude.com

  1. 14:19 UTC

    Investigating

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

  2. 14:21 UTC

    Identified

    We have identified the cause of elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1 and are working on a fix. We will provide an update as soon as possible.

  3. 14:28 UTC

    Monitoring

    A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring for recovery.

  4. 14:28 UTC

    Monitoring

    A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.

  5. 14:37 UTC

    Resolved

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

Other Claude Code incidents

Nov 826 minDegraded performance for Claude Fable 5.1Details
Oct 283 h 46 minElevated errors affecting the Google Calendar connectorDetails
Oct 281 h 49 minElevated errors affecting the Gmail connectorDetails
All Claude Code incidents

Other agents

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