Z.ai: GLM 4.5 Air

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...

Modalities

In / out price

$0.13 / $0.85 per 1M

Context

131K

Released

Jul 25, 2025

Why use GLM 4.5 Air

Step-by-step reasoning mode
Tool and function calling (agent-ready)

Pricing

Input	$0.13 / 1M tokens
Output	$0.85 / 1M tokens
Cached input (read)	$0.025 / 1M tokens

List prices via OpenRouter, checked daily. Real cost depends on the provider and on reasoning tokens.

Cost calculator

Pick a task, set how often you run it, and compare what it costs on each model.

TaskInput tokens≈ 602 wordsOutput tokens≈ 1,504 wordsRuns per month

Input served from cache: 0%Repeated prompts (same instructions or document) are billed at the cheaper cache-read price where the model supports it.

Model	Per run	Per month	Per 1,000 runs
Z.ai: GLM 4.5 Air	$0.0018	$1.80	$1.80

Estimates from list prices via OpenRouter; real bills vary by provider and reasoning tokens.

Will it fit? Context window simulator

Each square is about one page (500 words). Colored squares are your content; grey squares are free space in the model's context window.

Your content

Novel (90,000 words)

Total: about 120,000 tokens (≈ 90,226 words). Token counts are estimates.

Models

Zoom (square size): 6pxZoom out to see a whole million-token window at once.

Z.ai: GLM 4.5 Air

131,072 tokens ≈ 198 pages

Fits: uses 92% of the window.

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Why use GLM 4.5 Air

Pricing

Cost calculator

Will it fit? Context window simulator

Z.ai: GLM 4.5 Air

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