--- title: Z.ai: GLM 4.5 Air (free) API | Text Generation | ModelsLab description: Free, efficient MoE LLM with 106B total / 12B active params, 128K context, function calling, reasoning & coding for agentic apps—runs on RTX. url: https://modelslab.com/models/z-ai/z-ai-glm-4.5-air-free.md canonical: https://modelslab.com/models/z-ai/z-ai-glm-4.5-air-free.md type: product component: Playground/LLM/Index generated_at: 2026-04-14T22:32:29.314729Z --- Z.ai: GLM 4.5 Air (free) --- [LLMs.txt](https://modelslab.com/models/open_router/z-ai-glm-4.5-air-free/llms.txt) [.md](https://modelslab.com/models/z-ai/z-ai-glm-4.5-air-free.md) z-ai-glm-4.5-air-free z-ai Closed Source Model Z.ai: GLM 4.5 Air (free) --- Choose a prompt below to get started or type your own message Explain quantum computing in simple terms Write a Python function to sort a list Create a marketing email for a SaaS product Compare REST vs GraphQL APIs Send ### Z.ai: GLM 4.5 Air (free) z-ai z-ai-glm-4.5-air-free Copy model ID PricingInput $0.00 / 1M tokens Output $0.00 / 1M tokens API EndpointsOpenAI Compatible `https://modelslab.com/api/v7/llm/chat/completions`Endpoint Anthropic Compatible `https://modelslab.com/api/v7/llm/v1/messages`Messages `https://modelslab.com/api/v7/llm/v1/messages/count_tokens`Count Tokens `https://modelslab.com/api/v7/llm/v1/models`Models Use with Claude Code cURL Example ParametersSystem MessageYou are a helpful AI assistant specialized in providing accurate and detailed responses. 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Like GLM-4.5, it adopts the Mixture-of-Experts (MoE) architecture but with a more compact parameter... ### Technical Specifications Model IDz-ai-glm-4.5-air-freeCategoryLLM ModelsTaskText GenerationAddedFebruary 20, 2026 ### Key Features - Chat completion and multi-turn conversation API - Streaming response with token-by-token output - Function calling and tool use support - System prompts and role-based messaging - JSON mode and structured output ### Quick Start Integrate Z.Ai: GLM 4.5 Air (Free) into your application with a single API call. Get your API key from the [pricing page](https://modelslab.com/pricing) to get started. PythonJavaScriptcURLPHP ``` import requests import json url = "https://modelslab.com/api/v7/llm/chat/completions" headers = { "Content-Type": "application/json" } data = { "model_id": "z-ai-glm-4.5-air-free", "messages": [ { "role": "user", "content": "Hello!" } ], "max_tokens": 1000, "key": "YOUR_API_KEY" } try: response = requests.post(url, headers=headers, json=data) response.raise_for_status() # Raises an HTTPError for bad responses (4XX or 5XX) result = response.json() print("API Response:") print(json.dumps(result, indent=2)) except requests.exceptions.HTTPError as http_err: print(f"HTTP error occurred: {http_err} - {response.text}") except Exception as err: print(f"Other error occurred: {err}") ``` View the [full API documentation](https://modelslab.com/models/z-ai/z-ai-glm-4.5-air-free/api) for SDKs, code examples in Python, JavaScript, and more. ### Use Cases - AI chatbots and virtual assistants - Code generation and developer tools - Content writing and copywriting automation - Data analysis, summarization, and extraction [Browse LLM Models](https://modelslab.com/models?feature=llmaster) [More from Z Ai](https://modelslab.com/models/open_router) [View Pricing](https://modelslab.com/pricing) Z.Ai: GLM 4.5 Air (Free) FAQ --- ### What is Z.Ai: GLM 4.5 Air (Free)? 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... ### How do I use the Z.Ai: GLM 4.5 Air (Free) API? You can integrate Z.Ai: GLM 4.5 Air (Free) into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "z-ai-glm-4.5-air-free" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation. ### What is the Z.Ai: GLM 4.5 Air (Free) model ID? The model ID for Z.Ai: GLM 4.5 Air (Free) is "z-ai-glm-4.5-air-free". Use this ID in your API requests to specify this model. ### Does Z.Ai: GLM 4.5 Air (Free) have a free tier? Yes, ModelsLab offers a free tier that lets you try Z.Ai: GLM 4.5 Air (Free) and other AI models. Sign up to get free API credits and start building immediately. --- *This markdown version is optimized for AI agents and LLMs.* **Links:** - [Website](https://modelslab.com) - [API Documentation](https://docs.modelslab.com) - [Blog](https://modelslab.com/blog) --- *Generated by ModelsLab - 2026-04-15*