They deliberately trained the models in how to use various hacking tools, didn't give them the standard alignment training let them know where the answer key was left the models with access to said tool and told them to maximize their score then left them unsupervised for days with internet access (yeah they were sandboxed but again handed hacking tools and the training to use them if they really did want them to access the internet you wouldn't plug in the Ethernet cable) they wanted this to happen