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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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The U.S. artificial intelligence company Anthropic announced that it is investigating unauthorized access to its powerful Mythos model, which the company fears can become a valuable tool for hackers. Anthropic said weeks ago that initially limited the launch of Mythos to 40 large tech firms to give them advantage in correcting cybersecurity vulnerabilities before they could be exploited by attackers. According to Bloomberg, a small group of user…

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