What is the context window of Z.ai: GLM 4.5 Air?

Z.ai: GLM 4.5 Air supports a context window of 131K tokens.

Is Z.ai: GLM 4.5 Air free to use?

Z.ai: GLM 4.5 Air is a paid model. It costs $0.130 per million input tokens and $0.850 per million output tokens.

How is LLM API pricing calculated?

LLM pricing has two components: input tokens (everything you send) and output tokens (what the model generates). Total cost = (prompt tokens × input rate + output tokens × output rate) / 1,000,000 × number of requests.

Z.ai: GLM 4.5 Air API Pricing — $0.130 Input / $0.850 Output per 1M Tokens

Q: How much does Z.ai: GLM 4.5 Air cost?

Z.ai: GLM 4.5 Air costs $0.130 per million input tokens and $0.850 per million output tokens via OpenRouter. Pricing was last updated Oct 29, 2026.

Z.ai: GLM 4.5 Air by Z Ai — $0.130 input / $0.850 output per 1M tokens via OpenRouter. Context: 131K tokens. Pricing last updated Oct 29, 2026.

Input / 1M tokens

$0.130

Output / 1M tokens

$0.850

Provider

Z Ai

Context window

131K tokens

Via

OpenRouter

Cost at common usage volumes

Usage	Daily	Monthly
Chatbot (100/day)	$0.113	$3.38
Small app (1K/day)	$0.555	$16.65
Mid-scale (10K/day)	$6.85	$205.50
Large scale (100K/day)	$150.00	$4500.00

Model ID: z-ai/glm-4.5-air
Data source: OpenRouter public API — updated Oct 29, 2026.

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About Z.ai: GLM 4.5 Air

Z.ai: GLM 4.5 Air is an LLM developed by Z Ai. Input costs $0.130 per million tokens and output costs $0.850 per million tokens via OpenRouter. It supports a context window of 131K tokens.

Pricing Details

Via the OpenRouter API:

Input tokens: $0.130 per 1 million tokens
Output tokens: $0.850 per 1 million tokens

A token is roughly 0.75 words. For context: a typical user message of 100 words is approximately 133 tokens; a 500-word system prompt is about 650 tokens.

How Much Does Z.ai: GLM 4.5 Air Cost?

For a typical chatbot application (1,000 requests/day, 1,000 prompt tokens and 500 output tokens per request):

Daily cost: $0.5550
Monthly cost: $16.650

Accessing Z.ai: GLM 4.5 Air via OpenRouter

OpenRouter provides a unified API for 200+ LLMs including Z.ai: GLM 4.5 Air. You can use it with any OpenAI-compatible SDK by setting the base URL to https://openrouter.ai/api/v1 and using your OpenRouter API key. The model ID is z-ai/glm-4.5-air.

Compare Z.ai: GLM 4.5 Air with Other Models

Use the AI Model Cost Comparison tool to compare Z.ai: GLM 4.5 Air against GPT-4o, Claude 3.5 Sonnet, Gemini 1.5 Pro, or any other model side by side. Or use the LLM API Cost Calculator to browse all 456+ models sorted by cost for your specific usage.

Frequently Asked Questions

Yes. Z.ai: GLM 4.5 Air is available on OpenRouter with the model ID z-ai/glm-4.5-air. OpenRouter provides a unified API compatible with OpenAI's SDK format.