China Finally Beats MYTHOS 5 With New GLM 5.3 (Plus Anthropic's New Model 2)

Z AI says its open-weight GLM-5.3 matches or slightly beats Anthropic’s Mythos 5 at finding software vulnerabilities, but Anthropic still leads by a wide margin in turning bugs into working exploits and in attack speed. Benchmark claim On CyberGym, a benchmark for reading code, spotting flaws and confirming they are real, GLM-5.3 scored 84.5% against a reported 83.8% for Mythos 5. The result, if validated, would put a Chinese open-weight model at parity or slightly ahead on one of the most sensitive AI cyber capabilities. The figures have not been independently verified.

Sources from the briefing

• China Finally Beats MYTHOS 5 With New GLM 5.3 (Plus Anthropic's New Model 2)AI Revolution