Z.ai says GLM-5.3 edged Anthropic's Mythos 5 on a cyber test

Chinese AI firm Zhipu AI (HKG: 2513) has gone big-game hunting with the document it released along with the rollout of its latest GLM-5.3 model.

The firm, trading internationally as Z.ai, specifically named Anthropic’s Mythos 5 as one of the models that GLM-5.3 outperformed on the CyberGym benchmark, which measures a model’s capability to check source code for software vulnerabilities.

GLM-5.3 runs on the same base model as GLM-5.2, a 743-billion-parameter mixture-of-experts design that activates roughly 40 billion parameters per token.

How does Z.ai’s GLM-5.3 compare to other models?

According to the numbers popularized by Z.ai, its GLM-5.3 scored 84.5% on the CyberGym benchmark, which is less than a single point’s lead over Anthropic’s Mythos 5 (83.8%) and OpenAI’s GPT-5.6 Sol (83.6%).

Beating out Mythos could see Z.ai sliding into the number one spot for developers and security teams looking to deploy open-weight models to combat attacks. The firm has said that the model has flagged more than a thousand serious bugs in live software already.

… Continue reading the full article at the original source below.