GLM-5.2

GLM-5.2 is positioned by Z.ai as a flagship model engineered specifically for long-horizon work, building directly on its predecessor GLM-5.1 with what the provider describes as a substantial leap in sustained task capability. The headline change is the cataloged API limit context window that Z.ai characterizes as "solid," meaning it is intended to hold quality across long, messy coding-agent trajectories rather than merely accept a large input. To make that long context practical, the model pairs a flexible thinking-effort control with stronger coding ability, letting developers trade raw performance against latency depending on the job. The result is a model aimed squarely at agentic coding, multi-step tool use, and any workflow where the conversation or codebase easily outgrows shorter windows.

Beneath those product-level choices, GLM-5.2 introduces an architectural refinement called IndexShare, which reuses the same indexer across groups of sparse attention layers and is reported by Z.ai to cut per-token compute by roughly 2.9× at the cataloged API limit tokens. The multi-token prediction layer has also been tuned, with the provider claiming up to 20% longer acceptance during speculative decoding for faster inference on long outputs. Weights are released openly on Hugging Face under the zai-org organization alongside a public GitHub repository, and Z.ai exposes the model both through its chat interface and API, making GLM-5.2 a practical choice for teams that want a long-context, open-weights workhorse for coding agents and other extended reasoning pipelines.