Elevated errors on Claude 4 Sonnet

Incident Report for Anthropic

Resolved

As of 1:05 PT / 8:05 UTC the errors are back to the baseline.
Posted Sep 16, 2025 - 08:32 UTC

Investigating

We are investigating an issue with Claude Sonnet 4.0 that started at 23:35 PT / 6:35 UTC.
Posted Sep 16, 2025 - 07:02 UTC
This incident affected: claude.ai, console.anthropic.com, api.anthropic.com, and Claude Code.