Official Claude API incident · Oct 27, 2026

Elevated errors for Claude Sonnet 5.5

Major impact Claude API incident on Oct 27, 2026, lasting 42 min. Read the official timeline and compare it with community reports from the same day.

ImpactMajor impactDuration42 minFinal statusresolved

Official timeline

What happened

Oct 27, 2026, 9:14 AM UTCinvestigating

We are investigating elevated errors on requests to Claude Sonnet 5.5. We will provide an update as soon as possible.

Oct 27, 2026, 9:38 AM UTCmonitoring

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

Oct 27, 2026, 9:56 AM UTCresolved

The issue affecting Claude services has been resolved.

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.