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

Affected components

• Claude API (api.anthropic.com)
• Claude Code
• Claude Cowork
• claude.ai

1. resolvedJul 27, 2026, 14:36 UTC

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

2. investigatingJul 27, 2026, 14:04 UTC

   Haiku 4.5 is also returning errors.

3. investigatingJul 27, 2026, 13:42 UTC

   We are currently investigating this issue.

4. investigatingJul 27, 2026, 13:41 UTC

   We are continuing to investigate this issue.

5. investigatingJul 27, 2026, 13:39 UTC

   We are currently investigating this issue.

What APIStatus.watch saw

Our 5-minute checks didn't record a change in Anthropic's overall status around this incident. Smaller or regional incidents often leave a provider's overall status green.

Other services with incidents at the same time

Overlapping incidents aren't necessarily related.

• OVHcloud: [GRA11][Network] - Load Balancer incident notificationMajor · Jul 27, 2026, 12:52 UTC
• Zoom: Service Degradation Affecting Offline Meeting transcription in US Region.Minor · Jul 27, 2026, 09:08 UTC
• RevenueCat: Newly created apps error with "The key is not valid or is not compatible with the Bundle ID of your app"Minor · Jul 27, 2026, 10:14 UTC

How often does Anthropic have incidents?

Anthropic reported 47 incidents in the last 90 days, 21 of them major or critical. A typical incident lasted 1h 4m. See Anthropic's uptime and incident history