Elevated errors for Claude Sonnet 5.5 and other models

Incident Report for Claude

Monitoring

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

Posted Oct 25, 2026 - 06:35 UTC

Identified

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.

Posted Oct 25, 2026 - 06:27 UTC

Investigating

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.

Posted Oct 25, 2026 - 06:14 UTC

This incident affects: claude.ai, Claude API (api.anthropic.com), Claude Code, and Claude Cowork.