# Z.ai GLM 4.5 Air API

> GLM-4.5-Air is the lightweight member of Z.ai's GLM-4.5 family, a mixture-of-experts model with 106B total and 12B active parameters built as a foundation model for agent-oriented applications. It offers hybrid reasoning, with a thinking mode for complex reasoning and tool use and a non-thinking mode for instant replies, and is tuned for tool calling, web browsing, software engineering and front-end development. Choose GLM-4.5 for more capacity.

Source: https://www.sandbase.ai/models/z-ai/glm-4.5-air
API reference: https://www.sandbase.ai/models/z-ai/glm-4.5-air/docs

## Facts

- Provider: Z.ai
- Type: Language model
- Model ID: `z-ai/glm-4.5-air`
- Price: $0.20 per 1M input tokens, $1.10 per 1M output tokens
- Context window: 131.1K tokens, up to 98.3K output tokens
- Capabilities: chat, reasoning, function calling
- Billing: pay per use from one SandBase balance; no provider account or subscription needed

## Call it

- Chat Completions API: `POST https://api.sandbase.ai/v1/chat/completions`

```bash
curl -X POST https://api.sandbase.ai/v1/chat/completions \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "z-ai/glm-4.5-air",
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ],
  "max_tokens": 2048
}'
```

## FAQ

### How do I call Z.ai GLM 4.5 Air through SandBase?

Create a SandBase API key, then send requests with the model ID "z-ai/glm-4.5-air" to Chat Completions API (/v1/chat/completions) at https://api.sandbase.ai. The request examples on this page show the exact payload.

### How much does Z.ai GLM 4.5 Air cost?

$0.20 per 1M input tokens and $1.10 per 1M output tokens, billed per request from your SandBase balance. Discounts, when available, are shown in the pricing on this page.

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

131.1K tokens of context, with up to 98.3K output tokens per response.

### How does Z.ai GLM 4.5 Air score on benchmarks?

Z.ai GLM 4.5 Air scores 11.1 on the Artificial Analysis Intelligence Index (v4.3), ranking #72 of 83 models on SandBase. Source: Artificial Analysis, measured as GLM-4.5-Air.

### Which features does Z.ai GLM 4.5 Air support?

Z.ai GLM 4.5 Air supports reasoning, function calling. See Specifications above for the full list.

### Do I need a separate Z.ai account?

No. One SandBase API key and balance gives you access to Z.ai GLM 4.5 Air and the other models in the catalog; you do not need to sign up with Z.ai separately.