Chinese AI firm Z.ai, formerly known as Zhipu, has launched GLM-4.5, an open-source language model designed for intelligent agent applications, as competition heats up among China’s fast-growing generative AI startups. GLM-4.5 will be available in two versions, with the flagship model featuring 355 billion parameters and a lighter variant, GLM-4.5-Air, running on 106 billion parameters.