Anthropic Investigates Authentication Failures Across Claude Ecosystem

Anthropic has acknowledged a widespread authentication issue that is preventing users from accessing its core AI services, including the main Claude web interface and developer-focused tools. The incident, first reported on November 13, 2026, has disrupted both consumer and enterprise workflows by causing login failures and session crashes.

Scope of the Authentication Incident

Anthropic issued an official incident report noting elevated errors for users attempting to authenticate to their services. The disruption is broad, impacting multiple entry points across the Claude ecosystem.

The primary systems affected include the main web interface (claude.ai) and the developer-facing Claude Console at platform.claude.com. The issue also extends to Claude Code and Claude Cowork, which are essential for developer workflows and enterprise environments.

“We are investigating an issue with users authenticating to Claude.ai and Claude Code.”

— Elevated errors on claude.ai, Claude Code, and platform.claude.com

Reported User Symptoms

While the official status remains in the 'Investigating' phase, users have documented specific technical failures during the login process. These include 'OAuth request failed' messages and prompts stating that the system is 'Temporarily unable to authenticate.'

These authentication hurdles have led to inconsistent behavior, with some users experiencing session crashes or being forced to perform repeated, unsuccessful login attempts.

Current Status and Investigation

Anthropic's status page indicates that the team is actively investigating the cause of the authentication errors. As of the initial report, the company has committed to providing updates as soon as possible.

The official report does not currently specify whether the issue is internal to Anthropic's infrastructure or a result of a third-party service disruption. Until a root cause is identified, the status remains under investigation.