Anthropic outage: Elevated errors for Claude Sonnet 5

Affected components

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

1. resolvedSep 3, 2026, 12:56 UTC

   This incident has been resolved.

2. monitoringSep 3, 2026, 12:47 UTC

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

3. investigatingSep 3, 2026, 12:37 UTC

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

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.

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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