Elevated errors on Claude Haiku 4.5

Incident Report for Claude

Resolved

The incident has now been resolved. The elevated error rate for Haiku 4.5 was between 4:53 PT / 11:53 UTC and 5:36 PT / 12:44 UTC.
Posted Apr 28, 2026 - 12:45 UTC

Monitoring

A fix has been implemented and we are monitoring the results.
Posted Apr 28, 2026 - 12:38 UTC

Investigating

We are currently investigating this issue.
Posted Apr 28, 2026 - 12:24 UTC
This incident affected: claude.ai and Claude API (api.anthropic.com).