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Anthropic: Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

  1. Investigating(done)
  2. Trending(skipped)
  3. Workaround available(skipped)
  4. Resolved(done)
  5. Archived

Executive summary

Elevated error rates have been observed on requests to Claude Mythos 5.1 and Claude Fable 5.1, affecting users since 05:40 PT / 12:40 UTC to 06:10 PT / 13:10 UTC. The issue has now been resolved.

No verified workaround yet

This incident was resolved upstream without a reported workaround.

Official fix
Technical root cause

Under active investigation. No report has identified a root cause yet.

Evidence

1 report · 1 StatusShow
  1. [1]
    Status First report
    Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1(opens official status page in a new tab)

    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. Resolved: The issue affecting Claude Mythos 5.1 and Claude Fable 5.1 has been resolved. Impact occurred from 05:40 PT / 12:40 UTC to 06:10 PT / 13:10 UTC.

    by anthropic status

Timeline

  1. First report on status page

    Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

    Source
  2. Official statement

    Investigating: We are investigating elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1.

    Source
  3. Status changed

    Status changed: new → archived (resolved more than 14 days ago).