Z.ai: GLM 4.5 Air

GLM-4.5-Air is the lightweight variant of our latest flagship model family, also purpose-built for agent-centric applications. Like GLM-4.5, it adopts the Mixture-of-Experts (MoE) architecture but with a more compact parameter size. GLM-4.5-Air also supports hybrid inference modes, offering a "thinking mode" for advanced reasoning and tool use, and a "non-thinking mode" for real-time interaction.

Yes. The pricing shown on this page for GLM 4.5 Air is zero, so you are not charged for prompt or completion tokens. Free endpoints are rate limited — see the rate limit docs.

GLM 4.5 Air has a 131,072 token context window.

GLM 5.3, GLM 5.2, GLM 5.1 and 9 more are other text models from Z.ai.

GLM 4.5 Air was released on July 25, 2025. Its knowledge cutoff is December 31, 2024.