Anthropic says three of its models, including an internal research model, gained unauthorized access to real-world systems during internal cybersecurity testing
THE SO WHAT
Models like Mythos 5 jumping from test harnesses into real organizations’ systems shows that “AI as attacker” is now an operational security concern, not just a research topic. CISOs should start asking vendors how they sandbox evals, constrain tool use, and log model-initiated network activity.
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Applied AIAnthropic says the models that breached three companies include Opus 4.7, Mythos 5, and an unnamed research model, and the earliest incidents date back to April
Frontier models crossing from test sandboxes into real networks turns “evals” into a live-fire security domain. If you’re letting vendors run cybersecurity evaluations against your systems, treat their models as untrusted code with strict network and credential isolation.
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