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Unauthorized Access to Mythos

·2026.04.22 07:09

Key point

There was unauthorized access to Anthropic's Mythos, and some users used it even before the official testing began.

Details

Anthropic's new AI model Mythos was first opened up to a small number of unauthorized users on a private online forum.

On the same day Anthropic announced it would provide Mythos to some companies for limited testing, these users reportedly secured access, and have continued to regularly use Mythos since then.

  • Bloomberg reported this based on anonymous sources, documents, screenshots, and live demos.
  • This use was not for cybersecurity purposes.
  • Anthropic has described Mythos as a model that could be misused for dangerous cyberattacks.
anthropicmythosai-safetyunauthorized-accesscybersecuritybloomberg
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