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Incident detail

Elevated errors for multiple models

Resolved incidentMajor3 affected services

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Timeline

Incident updates

Every update Anthropic posted, oldest to newest, exactly as it appeared on their official status page.

  1. Investigating

    We are investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5. We will provide an update as soon as possible.

  2. Identified

    We have identified the cause of elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 and are working on a fix. We will provide an update as soon as possible.

  3. Identified

    An exhaustive list of affected models: Mythos/Fable 5.1, Mythos/Fable 5, Opus 5, Opus 4.8, Opus 4.6.

  4. Identified

    We are continuing to work on a fix for this issue.

  5. Identified

    The only affected models right now are Opus 4.8 and Opus 5. The rest of the models have recovered to baseline error rate.

  6. Monitoring

    A fix has been deployed for Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 and we are monitoring for recovery.

  7. Resolved

    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.

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