Anthropic investigates authentication errors hitting Claude AI and Claude Code

The company's status page logged the incident as starting at approximately 09:58 UTC on November 13, 2026. The disruption affects multiple services including claude.ai, Claude Code, and platform.claude.com, with Anthropic describing the issue as elevated errors tied to user authentication.

Service Impact

Different components were classified as experiencing either partial or major outages, with severity varying depending on which part of the service users were trying to access. Reports from users include expired credentials, authentication failures, and errors related to credential precedence and expired OAuth sessions.

OAuth is the system that allows users to sign in once and stay signed in through a digital token, while credential precedence refers to which login method a tool trusts first when multiple options are available.

Previous Issues

This incident marks another authentication problem for Anthropic this year. On September 29, 2026, the company dealt with a similar episode involving elevated authentication errors and sign-in issues. Earlier in 2026, session-token theft incidents were reported, tied to infostealer malware.

Infostealers are malicious programs that copy saved logins and session data from a victim's computer. While the current errors aren't tied to those theft incidents, they represent a different kind of problem affecting legitimate users' access to their accounts.

User Impact

For individual users, an authentication outage is particularly frustrating as it prevents access to AI tools regardless of their capabilities. With Claude Code and platform.claude.com both affected, people who have integrated Anthropic's tools into their daily workflows could see their work grind to a halt until access is restored.

Anthropic's AI tools are seeing greater adoption, meaning more people depend on them. Continued service disruptions could deter new users and affect subscription rates, an important metric for measuring the success of their growing platform. Anthropic has not announced a resolution yet but has committed to keeping users informed as the investigation continues.