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Coverage dated April 21, 2026

Anthropic probes unauthorized access to Mythos AI model

Headline from Digital Journal

American AI developer Anthropic said Tuesday it was investigating unauthorized access to Mythos, its powerful model which the company itself worries could

Digital Journal's own description from its feed. We collect headlines and these descriptions, not full articles; read the original reporting below.

Earlier updates in this story

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Reports & sources

6 articles, oldest first.

  1. The Guardian

    Anthropic investigates report of rogue access to hack-enabling Mythos AI (opens The Guardian)

    Published

    The Guardian's feed description

    ‘Handful’ of people allegedly gain unauthorised access to model adept at detecting cybersecurity vulnerabilities

  2. Breitbart News

    AI Security Breach: Anthropic Investigates Unauthorized Access to Powerful 'Claude Mythos' Model (opens Breitbart News)

    Published

    Breitbart News's feed description

    AI startup Anthropic is investigating reports that a group of users gained unauthorized access to its Claude Mythos model, a powerful AI system that was deliberately released to only a small circle of trusted companies due to its advanced cybersecurity capabilities.

  3. Digital Journal

    Anthropic probes unauthorized access to Mythos AI model (opens Digital Journal)

    Published

    Digital Journal's feed description

    American AI developer Anthropic said Tuesday it was investigating unauthorized access to Mythos, its powerful model which the company itself worries could

  4. New York Post

    Outsiders breached Anthropic’s Claude Mythos same day ‘potentially dangerous’ AI model was revealed: report (opens New York Post)

    Published

    New York Post's feed description

    A handful of users managed to gain unauthorized access to Anthropic’s Claude Mythos – the model the company claims to be so dangerous that it would cause a wave of devastating cyberattacks if made available to the public.

  5. Engadget

    Anthropic is investigating 'unauthorized access' of its Mythos cybersecurity tool (opens Engadget)

    Published

    Engadget's feed description

    Anthropic is investigating potential "unauthorized access" to its Claude Mythos model that has been touted for its ability to find cybersecurity flaws.

  6. CBS News

    Anthropic investigating possible breach of its Mythos AI model (opens CBS News)

    Published

    CBS News's feed description

    The AI company behind the chatbot Claude is looking into a report of unauthorized access to Mythos from one of its third-party vendor environments.