Sonnet 4.6 elevated rate of errors

Incident Report for Claude

Resolved

The incident is now resolved. Sonnet 4.6 exhibited errors above baseline between 23:00 PT / 7:00 UTC and 1:50 PT / 9:50 UTC.

Posted Apr 08, 2026 - 09:33 UTC

Monitoring

A fix has been implemented and we are monitoring the results.

Posted Apr 08, 2026 - 09:01 UTC

Identified

The issue has been identified and a fix is being implemented.

Posted Apr 08, 2026 - 07:59 UTC

Update

We are continuing to investigate this issue.

Posted Apr 08, 2026 - 07:06 UTC

Investigating

We are currently investigating this issue.

Posted Apr 08, 2026 - 06:23 UTC

This incident affected: claude.ai, platform.claude.com (formerly console.anthropic.com), Claude API (api.anthropic.com), Claude Code, and Claude Cowork.