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Anthropic Probes Possible Unauthorized Access to Mythos AI Model

Anthropic says the group accessed the restricted model through a third-party vendor environment and that it has found no evidence its core systems were affected.

  • Bloomberg News reported on Tuesday that unauthorized users accessed Anthropic's new Mythos AI model through a third-party vendor, gaining entry on the same day the company announced the controlled release.
  • Announced on April 7, Mythos is deployed as part of Anthropic's Project Glasswing, a controlled initiative allowing select organizations including Apple to use the Claude Mythos Preview model for defensive cybersecurity.
  • The group utilized a Discord channel to identify unreleased models and combined information from a Mercor data breach with access held by an Anthropic contractor to guess the model's online location.
  • Anthropic confirmed it is investigating unauthorized access reports through vendor environments, stating so far it has found no evidence the activity impacted its internal systems.
  • The group told Bloomberg they are "interested in playing around with new models, not wreaking havoc," yet regulators remain concerned about Mythos's potential for misuse in the wrong hands.
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Lean Left

On the same day of the announcement, an unauthorized group accessed Mythos through a outsourced contractor, the story behind the cyber weapon circulating through an impossible-to-shield human chain.

·Buenos Aires, Argentina
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Lean Right

A group of people would have accessed, without authorisation, the model by means of a system configured for outsourced companies that provide services to Anthropic

·Brazil
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Bias Distribution

  • 41% of the sources are Center
41% Center

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Reuters broke the news in United Kingdom on Tuesday, April 21, 2026.
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