Z.ai: GLM 4.5 Air (free)

z-ai/glm-4.5-air:free

Released Jul 25, 2025131,072 context

$0/M input tokens$0/M output tokens

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

Providers for GLM 4.5 Air (free)

OpenRouter routes requests to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime.

Performance for GLM 4.5 Air (free)

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Effective Pricing for GLM 4.5 Air (free)

Actual cost per million tokens across providers over the past hour

Apps using GLM 4.5 Air (free)

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Total usage per day on OpenRouter

Prompt

7.49B

Reasoning

229M

Completion

168M

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.

Uptime stats for GLM 4.5 Air (free)

Uptime stats for GLM 4.5 Air (free) across all providers

Sample code and API for GLM 4.5 Air (free)

OpenRouter normalizes requests and responses across providers for you.

OpenRouter provides an OpenAI-compatible completion API to 300+ models & providers that you can call directly, or using the OpenAI SDK. Additionally, some third-party SDKs are available.

In the examples below, the OpenRouter-specific headers are optional. Setting them allows your app to appear on the OpenRouter leaderboards.

Using third-party SDKs

For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.

See the Request docs for all possible fields, and Parameters for explanations of specific sampling parameters.

GLM 4.5 Air (free) - API Pricing & Providers | OpenRouter