Major incident

Anthropic (Claude): Elevated errors for Claude Sonnet 5.5 and other models

Affected: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork

Current status of Anthropic (Claude): Operational — live Anthropic (Claude) status

Timeline

1. Oct 25, 2026, 06:14 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.
2. Oct 25, 2026, 06:27 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.
3. Oct 25, 2026, 06:35 UTC
   monitoring
   A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.
4. Oct 25, 2026, 07:53 UTC
   resolved
   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.

Updates as published by Anthropic (Claude) (original).