Z.ai: GLM 4.5 Air (free)
by z-ai
About
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. Users can control the reasoning behaviour with the `reasoning` `enabled` boolean. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#enable-reasoning-with-default-config)
Specifications
Error Rate
Based on feedback reported by Free LLM Router users. Error rate reflects the percentage of requests that encountered issues such as rate limiting, unavailability, or errors. Learn more.
Availability
Available 41 of 41 tracked days. Daily snapshots show whether this model was accessible as a free model on OpenRouter.
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| Z.ai: GLM 4.5 Air (free) | 30 | ||||||||||||||||||||||||||||||
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Frequently Asked Questions
Is Z.ai: GLM 4.5 Air (free) free to use?
Yes, Z.ai: GLM 4.5 Air (free) is completely free to use through OpenRouter. You can access it via the Free LLM Router API at no cost.
What is the context window for Z.ai: GLM 4.5 Air (free)?
Z.ai: GLM 4.5 Air (free) supports a context window of 131K tokens (131,072 tokens).
What is the maximum output length for Z.ai: GLM 4.5 Air (free)?
Z.ai: GLM 4.5 Air (free) can generate up to 96K tokens (96,000 tokens) per response.
Does Z.ai: GLM 4.5 Air (free) support function calling (tools)?
Yes, Z.ai: GLM 4.5 Air (free) supports function calling / tool use, enabling it to interact with external APIs and services.
Does Z.ai: GLM 4.5 Air (free) support reasoning?
Yes, Z.ai: GLM 4.5 Air (free) supports reasoning capabilities, allowing it to show its step-by-step thought process.