Degraded outputs quality from Haiku 4.5

Incident Report for Claude

Monitoring

We observed a small fraction of outputs were degraded from Haiku 4.5 since 3pm on Nov 3 PST. Fix has been deployed on 10:45am on Nov 4 PST. Incident is mitigated. We are currently monitoring.

Posted Nov 04, 2025 - 22:09 UTC

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