Anthropic is investigating elevated authentication errors affecting Claude AI, Claude Code, and platform.claude.com, with the incident reported as starting at approximately 09:58 UTC on November 13, 2026. According to the company’s status page, some components are experiencing a partial or major outage, preventing certain users from signing in to their tools. Users have reported expired credentials, authentication failures, and issues related to credential precedence or expired OAuth sessions. Anthropic had not announced a resolution as of the latest update, following a similar incident on September 29, 2026.
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