Elevated errors on Claude 4 Sonnet

Incident Report for Anthropic

Resolved

This incident has been resolved.
Posted Jun 18, 2025 - 10:18 UTC

Monitoring

A fix has been implemented and we are monitoring the results.
Posted Jun 18, 2025 - 09:54 UTC

Identified

The issue has been identified and a fix is being implemented.
Posted Jun 18, 2025 - 09:49 UTC

Investigating

We're seeing as of 7:10 UTC / 00:10 PDT an elevated error rate on the Claude 4 Sonnet model.
Posted Jun 18, 2025 - 08:35 UTC
This incident affected: claude.ai, api.anthropic.com, and Claude Code.