Anthropic Claude Outages Disrupt Logins and API

Anthropic’s Claude AI chatbot and coding assistant experienced multiple service disruptions on Friday, November 13, 2026, preventing users from logging in and accessing the platform. The company opened an incident on its status page at 09:58 UTC, reporting authentication failures across Claude.ai, Claude Code and platform.claude.com. Claude.ai was marked a major outage, Claude Console and Claude Code partial, and Claude Cowork degraded.

The authentication problems marked the first of two separate incidents that affected Claude services throughout the day, with the initial issue affecting Claude.ai and Claude Cowork resolved by 11:58 UTC. However, additional performance issues emerged later in the afternoon.

Multiple Service Disruptions Hit Claude Platform

At 09:58 UTC (10:58 in Italy) Anthropic opened an incident rated “major” because users could not authenticate. The first update said, “We are investigating an issue with users authenticating to Claude.ai and Claude Code”. Anthropic deployed a fix at 11:05 UTC and moved Console and Claude Code back to “operational” status.

The relief proved temporary. At 13:52 UTC, Anthropic began investigating reports of degraded performance affecting Claude.ai, the Claude API, and Claude Code. By 14:36 UTC, the investigation had expanded to include a variety of surfaces including Claude.ai, the Claude API, Claude Code, connectors (including Claude Docs and Claude Sheets), Claude Security and Claude Managed Agents.

By 15:33 UTC, Anthropic reported seeing recovery on Claude.ai and the Claude API, though errors could return while the company continued working on the issue, and by 15:38 UTC errors had returned to normal levels.

Claude API Remained Operational Throughout First Outage

The Claude API was not listed as affected during the initial authentication incident. The Claude API (api.anthropic.com) showed as operational throughout the incident, as did the channels that run through the big cloud providers. This distinction meant developers using the API could continue their work while web and desktop users faced login problems.

However, the second wave of disruptions later in the day did impact the API alongside other services.

Microsoft 365 Connector Failures Add to User Problems

Claude users faced additional problems unrelated to the authentication outages. Anthropic’s status page tied trouble to a Microsoft outage, now in its second day. The Claude outage hit while Microsoft was still fighting a global Outlook and Teams outage that started Thursday and has now dragged into a second day.

Claude for Outlook was also affected, with Anthropic reporting the connector issue separately from its own authentication and performance incidents. Adding a new connector on Claude.ai remained temporarily unavailable as of the afternoon updates.

User Reports and Impact

Anthropic’s AI platform experienced authentication-related disruptions on November 13, affecting users trying to access Claude.ai and Claude Code. Users reported being logged out mid-session and encountering OAuth failures when attempting to sign in.

Users reported difficulties logging in and accessing AI tools, with complaints coming from users worldwide. The disruption affected both the web interface and desktop coding tools that developers rely on for their daily workflows.

Status Updates and Recovery Timeline

Anthropic maintained communication with users throughout the incidents via its status page at status.claude.com. The company provided regular updates as it investigated, deployed fixes, and monitored recovery efforts.

The timeline for the first authentication incident proceeded as follows:

09:58 UTC: Incident opened, investigating authentication issues
11:05 UTC: Fix deployed, monitoring recovery
11:58 UTC: Issue affecting Claude.ai and Claude Cowork resolved

The second incident followed a different pattern:

13:52 UTC: Investigating degraded performance reports
14:03 UTC: Scope expanded to include API and connectors
14:36 UTC: Investigation includes Security and Managed Agents
15:33 UTC: Recovery observed on Claude.ai and API
15:38 UTC: Errors returned to normal levels

Key Facts

Anthropic opened the first incident at 09:58 UTC on November 13, 2026, for authentication failures
Claude.ai was marked as a major outage; Claude Code and Console experienced partial outages
The Claude API remained operational during the initial authentication incident
A fix was deployed at 11:05 UTC for the authentication issue
A second, broader performance incident began at 13:52 UTC affecting multiple services
Errors returned to normal levels by 15:38 UTC
The Microsoft 365 connector remained affected due to an ongoing Microsoft outage

Sources

Written by

Mike Gingerich

Author

Author: Mike Gingerich, President of web firm Digital Hill, Co-Founder of TabSite .
Digital and Social Media Marketer, Speaker, and Business Consultant. Part geek, part marketer, total digital junkie! Seeking to add value, make the complex simple, and leave a positive impact.

Follow me on twitter: @mike_gingerich.