Claude Outage Hits Thousands as Login Failures Spread, Fix Deployed
Anthropic's Claude AI assistant suffered login failures on November 13, 2026, with more than 3,000 outage reports logged. The company deployed a fix and said it was monitoring recovery, as a separate Microsoft outage kept disrupting email and Teams.
Claude, the AI assistant from Anthropic, went down for thousands of users worldwide on November 13, 2026, as people struggled to log in to Claude.ai and Claude Code. Anthropic later said it had deployed a fix and was monitoring for recovery.
The outage tracker Downdetector showed more than 3,000 reports of problems with the assistant. The disruption came while a separate, large Microsoft outage was still unresolved.
What Anthropic said
Anthropic posted on its official Claude Status page that it was investigating "an issue with users authenticating to Claude.ai and Claude Code." The page also listed "elevated errors on claude.ai, Claude Code, and platform.claude.com."
A later update read: "A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery."
Not everyone was locked out. Some users could log in normally while others reported trouble on X, which suggests the failures were uneven.
Anthropic has not said what caused the login problem. It also has not said whether the failure is linked to the Microsoft disruption.
Microsoft outage continues
The Microsoft problem began late on the previous afternoon and left hundreds of thousands of users worldwide without access to email and Teams. Thousands reported they could not send or receive messages through Outlook.
Microsoft's Copilot AI assistant and other Microsoft 365 services were also disrupted. The company said it was working to restore services and admitted that fixes were not going "as expected."
The overlap made for a difficult day for workplace tools. Teams that rely on Microsoft 365 for communication and on Claude for AI help with writing or coding found both under strain at once.
Anthropic's status page is where updates on the recovery are being posted. The company said it would provide further information as soon as possible.
