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

Chinese AI startup Z.ai said on Friday its open-source GLM-5.3 model had neared Anthropic’s restricted Mythos 5 in identifying software vulnerabilities, bolstering the credentials of a Chinese AI challenger gaining traction among Western developers. Z.ai said GLM-5.3 scored 84.5 per cent on CyberGym, a test of whether a model can review code, identify security flaws and confirm that they are real. That was slightly higher than the 83.8pc it reported for Mythos 5. The results have not been independently verified. GLM-5.3 lagged behind Mythos 5 in converting discovered flaws into working attacks, a standard part of defensive security research. Z.ai said its model scored 54.4pc on the…