China's Z.ai says new model nears Anthropic's Mythos 5 in cyber-defence tests

Chinese startup Z.ai said on Friday its GLM-5.3 model neared Anthropic’s Mythos 5 in identifying software vulnerabilities. The model scored 84.5% on CyberGym tests. Gabriel Wagner said, “This shows that open-weight risk management practices in China are becoming more sophisticated.” Z.ai plans to release the model publicly in two weeks.