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Claude: Elevated errors for Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5

CriticalStatus: resolvededitedStarted Resolved (32 min)4 updatesstatus.claude.com (opens in new tab)

Affected components: claude.aiClaude API - api.anthropic.comClaude CodeClaude Cowork

Timeline of updates

  1. investigating

    We are investigating elevated errors on requests to Claude Fable 5.1. We will provide an update as soon as possible.

  2. identified

    We have identified the cause of elevated errors on requests to Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5, as well as fast mode requests to Opus 5.5 and are working on a fix. We will provide an update as soon as possible.

  3. monitoring

    We are seeing success rates return to normal for all affected models, and are continuing to monitor to ensure no further issues.

  4. resolved

    The issue affecting Claude models has been resolved. Impact occurred from 16:28 PT / 23:28 UTC on October 23 to 16:59 PT / 23:59 UTC on October 23.

Changes Rewindex caught on this incident

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How the archive is checked, and what it cannot prove.

Rewindex captured a newer version after the last checkpoint; the next run () commits it.

Impact, status and times are the vendor’s own, as last archived. View on status.claude.com (opens in new tab).

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