Claude outage on 12 November 2026
Major outageAn email when it goes down, and when it’s back.
“Elevated errors on claude.ai, the Claude API, and Claude Code”
On 12 November, Claude's Microsoft 365 connector and Claude for Outlook had errors: mail, calendar and search tools failed for many requests. The incident was open from 17:52 UTC on 12 November to 21:49 UTC on 13 November, but the status page's final update put the impact from 16:03 UTC on 12 November to 16:40 UTC on 13 November, attributed it to a Microsoft 365 service incident, and noted that occasional errors might continue. Other services, including GoDaddy, OpenAI, Greenhouse, Litmus, U-Haul and GitHub, also reported problems at the same time.
Claude’s own incident page ↗- When
- 17:53–21:50 UTC
- How long
- 27 h 57 min
- Incident open on its page
- 17:52–21:49 UTC
- Components affected
- 2
- Claude, 30 days before
- 6 other outages
What broke when
From Claude’s own status page: when it moved each component into trouble, and back.
At the same time
Started in the hour before or during it
And 1289 lesser-known services. Problems at the same time are a clue, never proof that one caused another.
Timeline
Times in UTC
- Investigating
- claude.ai: partial outage
- Cause identified
- Claude Cowork: partial outage
- claude.ai: degraded performance
- Claude Cowork: degraded performance
- Fix in place, monitoring
- Resolved
- claude.ai: back to normal
- Claude Cowork: back to normal
Where this comes from
Stackpulse reads Claude’s official status page at status.claude.com every minute. The times above are when it reported the problem; the summary is written from its updates and checked against them.
Stackpulse isn’t affiliated with Claude. Names and logos belong to their owners.