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Anthropic's Claude Fable 5.1 experiencing elevated errors

The AI service provider has identified the cause of widespread request failures and is working on a fix.

By The Downtime ยท Oct 25, 2026 ยท 8:30 AM ยทUpdated 50 minutes ago

Anthropic is experiencing elevated errors affecting its Claude Fable 5.1 service, which the company has classified as a major impact incident. The service currently remains in identified status as engineers work toward resolution.

Anthropic develops Claude, an AI assistant used by developers, enterprises, and individual users for a range of applications including software development, research, and content generation.

The incident began with Anthropic investigating elevated error rates on Claude Fable 5.1 requests. The company subsequently identified the underlying cause and shifted focus to implementing a fix, though details on the root cause were not disclosed in the status update.

This is a developing story. The Downtime will provide updates as Anthropic reports additional information.

๐Ÿ•’ Live updates (4)

resolved Oct 25, 8:49 AM

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

monitoring Oct 25, 8:30 AM

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

identified Oct 25, 8:17 AM

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.

investigating Oct 25, 8:17 AM

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

๐Ÿ“Ž Sources

Outage details are aggregated from official provider status pages. The Downtime reports them as a public service and is not affiliated with the providers named.

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