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Anthropic probes unauthorized access to Mythos AI

techApr 22, 2026147

Anthropic said Tuesday that unauthorized users accessed its restricted Mythos model through a third-party contractor account and that the company is investigating. Anthropic had already delayed Mythos's general release because the company says the model can spot undiscovered security holes that have existed for decades. Anthropic said it will assess the scope of access before any wider rollout of Mythos.

Key Highlights

Unauthorized users accessed Mythos via a third-party contractor account.
Anthropic delayed Mythos general release because it finds long-standing security holes.
Anthropic announced the investigation Tuesday to determine the access scope.
3 sources