Outage report · Partial outage
Claude outage on Sep 3, 2026
Elevated errors for multiple models
What happened
Claude reported a partial outage starting Sep 3, 2026, 13:26 UTC, affecting claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork. It was marked resolved at Sep 3, 2026, 16:23 UTC.
- The incident lasted 2h 57m from first report to resolution.
- It was the 2nd longest of 5 significant outages Claude reported in the 12 months up to it.
- Claude had reported 7 other partial or major outages in the 90 days before it.
- 12 other vendors we track reported a significant incident within 12 hours of it.
Latest update from Claude
The issue affecting Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 has been resolved. Impact has ended as of 9:16 PT / 16:16 UTC.
What our independent monitoring saw
Our independent monitoring of Claude started after this incident, so this report is based on Claude's status page.
Other outages around the same time
Significant incidents other vendors reported within 12 hours of this one.
Claude's overall reliability
Claude has a reliability score of 57.0/100, with 99.25% effective uptime and 39 incidents over the last 90 days.
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