Incident report · read from Anthropic's status page

Anthropic incident: Elevated errors on Claude Opus 5 and Haiku 4.5

Resolved after 56 m (27 Jul 2026, 13:39–14:36 UTC), impact minor, affecting Claude Cowork, Claude API (api.anthropic.com), claude.ai and Claude Code.

Timeline

1. 27 Jul 2026 at 13:39 UTC investigating

   We are currently investigating this issue.

2. 27 Jul 2026 at 13:41 UTC investigating

   We are continuing to investigate this issue.

3. 27 Jul 2026 at 13:42 UTC investigating

   We are currently investigating this issue.

4. 27 Jul 2026 at 14:04 UTC investigating

   Haiku 4.5 is also returning errors.

5. 27 Jul 2026 at 14:36 UTC resolved

   As of 7:34 PST / 14:34 UTC the errors have returned to baseline.

Affected components

• Claude Cowork: partial outage for 1 m
• Claude API (api.anthropic.com): partial outage for 1 m
• claude.ai: partial outage for 1 m
• Claude Code: partial outage for 1 m
• Claude Cowork: degraded for 55 m
• Claude API (api.anthropic.com): degraded for 55 m
• claude.ai: degraded for 55 m
• Claude Code: degraded for 55 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 16:20 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.