Skip to content

Incident detail

Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1

Resolved incidentMajor3 affected services

Timeline window

to

Get alerted the next time Anthropic breaks

Free email alerts for the handful of vendors you cannot afford to miss. No card, live in about a minute. Paid plans add Slack, Teams, Discord, and webhook delivery across your whole stack, plus higher API quotas.

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 Mythos 5.1 and Claude Fable 5.1. We will provide an update as soon as possible.

  2. 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.

  3. Monitoring

    A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring to ensure it has resolved the issue.

  4. Resolved

    A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring to ensure it has resolved the issue.

Keep exploring

More from Anthropic

Neighboring incidents on Anthropic's timeline and the rest of their record on OutageDeck.