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Anthropic Investigating Elevated Errors on Claude Mythos 5.1 and Claude Fable 5.1

Two Claude AI model versions experiencing elevated error rates as Anthropic investigates.

By The Downtime · Oct 5, 2026 · 1:15 PM ·Updated 1 week ago

Anthropic is investigating elevated errors affecting requests to Claude Mythos 5.1 and Claude Fable 5.1, marking a major impact incident. The company has not yet disclosed the underlying cause or provided an estimated timeline for resolution.

Anthropicis an AI safety company known for developing Claude, a family of large language models used by enterprises, developers, and researchers worldwide.

Timeline: At the time of this report, Anthropic's status page shows the incident remains under investigation with a commitment to provide updates as soon as possible.

This is a developing story. The Downtime will continue monitoring the situation and provide updates as new information becomes available.

🕒 Live updates (2)

resolved Oct 5, 1:21 PM

The issue affecting Claude Mythos 5.1 and Claude Fable 5.1 has been resolved. Impact occurred from 05:40 PT / 12:40 UTC to 06:10 PT / 13:10 UTC.

investigating Oct 5, 1:05 PM

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

📎 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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