Elevated error rates on Sonnet 4.5 1M context

Incident Report for Claude

Resolved

This incident has been resolved.
Posted Jan 10, 2026 - 15:41 UTC

Monitoring

A fix has been implemented and we are monitoring the results.
Posted Jan 10, 2026 - 15:16 UTC

Identified

The issue has been identified and a fix is being implemented.
Posted Jan 10, 2026 - 15:00 UTC

Update

We are continuing to investigate this issue.
Posted Jan 10, 2026 - 14:36 UTC

Investigating

We are currently investigating this issue.
Posted Jan 10, 2026 - 14:33 UTC
This incident affected: claude.ai, Claude API (api.anthropic.com), and Claude Code.