Claude incident: Degraded performance on Claude Sonnet 5

Affected components

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

1. resolvedAug 3, 2026, 15:29 UTC

   As of 15:20 UTC (8:20am PT), error rates on Claude Sonnet 5 have returned to baseline. This incident is resolved.

2. investigatingAug 3, 2026, 15:13 UTC

   We are currently investigating this issue.

What APIStatus.watch saw

Our 5-minute checks didn't record a change in Claude'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.

• Snowflake: INC20000129Critical · Aug 3, 2026, 14:11 UTC
• OVHcloud: [GLOBAL][Data & Analytics] - Data Platform Incident NotificationMajor · Aug 3, 2026, 14:14 UTC
• Twilio: Voice Call Failures from Twilio Phone Numbers to Core Communications United StatesMinor · Jul 28, 2026, 03:13 UTC
• Twilio: SMS Delivery Delays and Failures from Twilio to Metfone CambodiaMinor · Jul 29, 2026, 00:06 UTC
• Twilio: SMS Delivery Receipt Delays from Twilio to Liberty Mobile Puerto RicoMinor · Jul 29, 2026, 19:53 UTC
• Twilio: SMS Delivery Delays and Failures from Twilio to Unitel AngolaMinor · Jul 29, 2026, 22:49 UTC
• Supabase: Management API Performance DegradationMinor · Jul 31, 2026, 18:36 UTC
• Twilio: User Authentication Identity SNA Failure Increase for Indosat in IndonesiaMinor · Aug 3, 2026, 05:48 UTC
• Twilio: SMS Delivery Delays from Twilio to Econet BurundiMinor · Aug 3, 2026, 06:01 UTC
• Tailscale: Certificate creation issuesMinor · Aug 3, 2026, 08:39 UTC

How often does Claude have incidents?

Claude reported 85 incidents in the last 90 days, 32 of them major or critical. A typical incident lasted 1h 7m. See Claude's uptime and incident history