Updated 5:17 p.m. Eastern on September 2, 2026
Claude reports an ongoing investigation into elevated errors affecting Claude Sonnet 5. The incident is marked as major and currently under investigation.
What is affected
The incident affects requests to Claude Sonnet 5 across claude.ai, Claude API, Claude Code, and Claude Cowork.
Official update timeline
We are investigating elevated errors on requests to Claude Sonnet 5. We will provide an update as soon as possible.













