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Anthropic: Elevated errors for multiple models

Impact: majorStatus: resolvedStarted Resolved (1.6 h)5 updatesSource: stspg.io (opens in new tab)
Summary

Anthropic reported a major outage with elevated request errors affecting Claude Mythos 5 and 5.1, Claude Fable 5 and 5.1, and Claude Opus 5. The incident started 2026-09-22 00:57 UTC and resolved at 2026-09-22 02:35 UTC (1 h 37 min); Anthropic stated actual impact occurred from 00:50 UTC to 02:10 UTC.

Machine-written from the archived incident (Sol). Check the timeline before relying on it.

Affected components: Claude CoworkClaude API (api.anthropic.com)claude.aiClaude Code

Timeline of updates

  1. 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.

  2. 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.

  3. identified

    We are continuing to work to resolve errors affecting some models. At this time, requests to Claude Fable 5 and 5.1 and Mythos 5 and 5.1 have returned to normal success rates. We are working to resolve remaining errors affecting Claude Opus 5, and will provide an additional update shortly.

  4. monitoring

    We have seen success rates return to normal across affected models, and are monitoring closely to ensure no further issues.

  5. resolved

    This issue has been resolved. Impact occurred from 5:50pm PT / 00:50 UTC to 7:10pm PT / 02:10 UTC.

Rewindex changes for this incident

Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab). Anthropic profile · Recent Anthropic incidents · Markdown · JSON