Official Claude API incident · Oct 25, 2026

Elevated errors for Claude Sonnet 5.5 and other models

Major impact Claude API incident on Oct 25, 2026, lasting 1h 39m. Read the official timeline and compare it with community reports from the same day.

ImpactMajor impactDuration1h 39mFinal statusresolved

Official timeline

What happened

Oct 25, 2026, 6:14 AM UTCinvestigating

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.

Oct 25, 2026, 6:27 AM UTCidentified

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.

Oct 25, 2026, 6:35 AM UTCmonitoring

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

Oct 25, 2026, 7:53 AM UTCresolved

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.

Official incident details come from Anthropic Status. Community reports are voluntary submissions, not unique users or verified incident attribution. claudedumb.com is independent and not affiliated with Anthropic.