GLM-4.5 (Z AI)

GLM-4.5 is an open-source large language model released by Chinese AI company Z.ai in late July 2025, announced alongside a lighter sibling variant, GLM-4.5-Air, as part of the same launch. Z.ai's own blog frames the model around reasoning, coding, and agentic abilities, signaling an emphasis on tool-using and multi-step problem solving rather than purely conversational use. Early coverage positioned GLM-4.5 as delivering performance comparable to or better than major frontier models while being cheaper to operate than DeepSeek, reflecting Z.ai's strategy of high-capability open weights aimed at cost-sensitive developers and research teams.

Community adoption has quickly explored the model in agentic and coding pipelines, including integration experiments with Anthropic's Claude Code that leverage GLM-4.5 as an open-weights reasoning and tool-use engine behind familiar developer workflows. As a hybrid inference design suited to coding and tool calling, GLM-4.5 fits practical scenarios such as automated code generation, structured reasoning tasks, and orchestrated agent runs where openness and cost efficiency matter more than absolute peak benchmark scores. The combination of an open release, an agentic focus, and a positioning statement that targets parity with leading proprietary models makes GLM-4.5 a noteworthy option for teams building self-hosted or hybrid AI stacks.