
Open-Weight AI Closes In on Frontier Cyber Skills, but No Link to Japan's Breaches Is Proven
UK AISI measured two leading open-weight AI models at 4–7 months behind closed frontier models in cyber capability, with the same exercise costing roughly half as much to about 1/71 as much, depending on the model. Weighing overseas attack cases, the disclosed entry points of Japanese leaks and National Police Agency statistics, we ask whether criminals' improved capabilities can be called the cause of Japan's breaches.








