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Anthropic: Elevated errors for Claude Fable 5.1

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

Anthropic reported a major incident involving elevated errors for Claude Fable 5.1 across claude.ai, Claude API - api.anthropic.com, Claude Code and Claude Cowork, starting 2026-10-25 08:17 UTC. It remained open when archived (open for 0 min at the last update); Anthropic said it identified the cause and was working on a fix, without detailing either.

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

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 and are working on a fix. We will provide an update as soon as possible.

  3. monitoring

    A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.

  4. resolved

    The issue affecting Claude services has been resolved. Impact occurred from 01:08 PT / 08:08 UTC to 01:29 PT / 08:29 UTC.

Changes Rewindex caught on this incident

Archive proof

Rewindex commits each version of an incident it captures to a daily checkpoint, chains it to the day before, and has the checkpoint timestamped by FreeTSA and DigiCert. That proves these records existed by then and have not been changed since, by anyone, Rewindex included.

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

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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