AI·1 min read
Z.ai's GLM-5.3 Edges Past Mythos and GPT-5.6 on a Cybersecurity Benchmark
China's Zhipu shipped a new flagship without touching the base model. Every gain came from post-training. Its 84.5 on CyberGym lands above Anthropic's Mythos and OpenAI's GPT-5.6 Sol, but the weights are held back two weeks.