Reading Zhipu’s GLM-5.3 results past the headline number

Zhipu's GLM-5.3 model scored highest on the CyberGym benchmark for finding software vulnerabilities, surpassing Anthropic's Mythos 5 and OpenAI's GPT-5.6 Sol. However, on more complex exploit reasoning benchmarks, GLM-5.3 lagged behind its American counterparts. The company acknowledges these mixed results and plans to release the model weights publicly.