Incident report · read from Anthropic's status page

Anthropic incident: Degraded performance for Claude Opus 5, Claude Sonnet 5

Resolved after 1 h 32 m (17 Aug 2026, 13:56–15:29 UTC), impact minor, affecting Claude Cowork, Claude API (api.anthropic.com), claude.ai and Claude Code.

Timeline

1. 17 Aug 2026 at 13:56 UTC investigating

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

2. 17 Aug 2026 at 14:25 UTC investigating

   Claude Opus 5 is operational. Claude Sonnet 5 is degraded. We are investigating.

3. 17 Aug 2026 at 14:39 UTC monitoring

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

4. 17 Aug 2026 at 15:29 UTC resolved

   This incident has been resolved.

Affected components

• Claude Cowork: degraded for 43 m
• Claude API (api.anthropic.com): degraded for 43 m
• claude.ai: degraded for 43 m
• Claude Code: degraded for 43 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 16:16 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.