Resolved incident

Elevated errors for multiple models

Anthropic · Major · Started

Duration
2h 57m
Severity
Major
Status
Resolved

Summary

Major · 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.

View official incident ↗

Event timeline

How this incident unfolded, from the official status page.

  1. Investigating

    Anthropic

    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

    Anthropic

    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

    Anthropic

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

  4. Identified

    Anthropic

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

  5. Identified

    Anthropic

    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

    Anthropic

    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

    Anthropic

    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.