GLM-4.5-Air

GLM-4.5-Air sits as the streamlined sibling within Z.ai's flagship GLM-4.5 family, purpose-built for agent-centric applications where responsiveness and reasoning depth both matter. It adopts the same Mixture-of-Experts architecture as the larger GLM-4.5 but with a markedly more compact footprint, carrying 106 billion total parameters of which 12 billion activate per inference. This design lets teams tap into frontier-style capabilities without provisioning for the full 355B-parameter variant, making it a practical middle ground for production agent workflows that need strong tool orchestration alongside conversational fluency.

A defining trait of GLM-4.5-Air is its hybrid inference design, which exposes two complementary modes through a reasoning-enabled toggle. The thinking mode unlocks advanced reasoning and tool use for multi-step problem solving, while the non-thinking mode delivers immediate responses suited to real-time interaction. Model weights are openly published on Hugging Face under the zai-org organization, so developers can self-host, fine-tune, or audit the system. Combined with its substantial context window and text-to-text interface, the model fits well into pipelines that alternate between quick-turn dialogue and deeper deliberative passes.