Anthropic Investigating Elevated Errors Across Multiple Claude Models

Five Claude AI models experiencing service issues as company investigates root cause.

By The Downtime · Oct 25, 2026 · 6:15 AM ·Updated 1 hour ago

Anthropic is investigating elevated errors affecting requests to Claude Mythos 5.1, Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5. The incident is classified as major impact and remains under investigation.

Anthropric is an AI safety company that develops Claude, a large language model used by enterprises, developers, and consumers for a range of generative AI tasks.

The company posted the initial alert early today indicating the issue but has not yet disclosed a root cause or resolution timeline. Anthropic said it would provide an update as soon as possible.

This is a developing story. The Downtime will update as more information becomes available.

🕒 Live updates (7)

resolved Oct 25, 7:53 AM

The issue affecting Claude services has been resolved. Impact occurred from 23:05 PT on October 24 / 06:05 UTC on October 25 to 23:35 PT on October 24 / 06:35 UTC on October 25.

monitoring Oct 25, 6:35 AM

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

identified Oct 25, 6:27 AM

We have identified the cause of elevated errors on requests to Claude Sonnet 5.5 and are working on a fix. We will provide an update as soon as possible.

identified Oct 25, 6:27 AM

We have identified the cause of elevated errors on requests to Claude Sonnet 5.5 and are working on a fix. We will provide an update as soon as possible.

investigating Oct 25, 6:14 AM

We are investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5. We will provide an update as soon as possible.

investigating Oct 25, 6:14 AM

We are investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5. We will provide an update as soon as possible.

investigating Oct 25, 6:14 AM

We are investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5. We will provide an update as soon as possible.

📎 Sources

Anthropic status ↗

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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