Elevated errors on Claude Sonnet 4.0

Incident Report for Anthropic

Resolved

As of 23:50 PT / 6:50 UTC, we have mitigated the incident.
Posted Sep 04, 2025 - 07:00 UTC

Investigating

We are investigating an issue with Claude Sonnet 4.0 that started at 23:25 PT / 6:25 UTC.
Posted Sep 04, 2025 - 06:44 UTC
This incident affected: claude.ai, console.anthropic.com, api.anthropic.com, and Claude Code.