Claude (Anthropic) Status

← Claude (Anthropic)

Elevated errors for multiple models

Official status page Resolved

Started
Sep 3, 2026 · 13:26 UTC
Resolved
Sep 3, 2026 · 16:23
Lasted
2h 57m
Affected components
claude.ai Claude API (api.anthropic.com) Claude Code Claude Cowork

Updates

  1. 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.

  2. 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.

  3. 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.

  4. Identified

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

  5. Identified

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

  6. 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.

  7. 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.

View on the official status page ↗