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Incident detail

Elevated errors for Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5

Resolved incidentCritical3 affected services

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Timeline

Incident updates

Every update on the official status source, oldest to newest, exactly as it appeared there.

  1. Investigating

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

  2. Identified

    We have identified the cause of elevated errors on requests to Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5, as well as fast mode requests to Opus 5.5 and are working on a fix. We will provide an update as soon as possible.

  3. Monitoring

    We are seeing success rates return to normal for all affected models, and are continuing to monitor to ensure no further issues.

  4. Resolved

    The issue affecting Claude models has been resolved. Impact occurred from 16:28 PT / 23:28 UTC on October 23 to 16:59 PT / 23:59 UTC on October 23.

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