Increased error rate on Claude 4 Sonnet

Incident Report for Claude

Resolved

This incident has been resolved.
Posted Nov 19, 2025 - 05:27 UTC

Identified

The issue has been identified and a fix is being implemented.
Posted Nov 19, 2025 - 02:00 UTC
This incident affected: claude.ai, platform.claude.com (formerly console.anthropic.com), Claude API (api.anthropic.com), and Claude Code.