Incident report · read from Anthropic's status page

Anthropic incident: Elevated errors for Claude Sonnet 5

Resolved after 18 m (3 Sep 2026, 12:37–12:56 UTC), impact major, affecting Claude Cowork, Claude API (api.anthropic.com), claude.ai and Claude Code.

Timeline

1. 3 Sep 2026 at 12:37 UTC investigating

   We are investigating elevated errors on requests to Claude Sonnet 5. We will provide an update as soon as possible.

2. 3 Sep 2026 at 12:47 UTC monitoring

   A fix has been implemented and we are monitoring the results.

3. 3 Sep 2026 at 12:56 UTC resolved

   This incident has been resolved.

Affected components

• Claude Cowork: partial outage for 9 m
• Claude API (api.anthropic.com): partial outage for 9 m
• claude.ai: partial outage for 9 m
• Claude Code: partial outage for 9 m

Source

Anthropic's own report of this incident, on Anthropic's status page. This page is a record of Anthropic's own report; where the two disagree, theirs is right.

Last checked 8 Sep 2026 at 15:05 UTC.

Must Have AI is a parody and is not affiliated with, endorsed by or connected to OpenAI, Anthropic or Google. Every outage shown here is read from the provider's own public status page.