Evaluating GLM 5.3 on Hack The Box Challenges

The GLM 5.3 model was released just last week. The interesting fact is that it’s just a retrained version of GLM 5.2, which doesn’t give you much hope for good results. But Z.ai’s marketing gave us sentences like: “As we scaled post-training, cyber capability developed faster than we expected.” and graphs showing better results in CyberGym than both Mythos 5 and GPT-5.6 Sol. Also, the last model I…