--- title: Z.ai: GLM 5.1 API | Text Generation | ModelsLab description: Build with Z.ai: GLM 5.1 API by Z Ai. Text generation, chat, code, and reasoning. Pay-per-use. Free tier. url: https://modelslab.com/models/z-ai/z-ai-glm-5.1.md canonical: https://modelslab.com/models/z-ai/z-ai-glm-5.1.md type: product component: Playground/LLM/Index generated_at: 2026-04-15T00:21:06.271752Z --- Z.ai: GLM 5.1 --- [LLMs.txt](https://modelslab.com/models/open_router/z-ai-glm-5.1/llms.txt) [.md](https://modelslab.com/models/z-ai/z-ai-glm-5.1.md) z-ai-glm-5.1 z-ai Closed Source Model $2.050000 / call Z.ai: GLM 5.1 --- 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 5.1 z-ai z-ai-glm-5.1 Copy model ID PricingInput $0.95 / 1M tokens Output $3.15 / 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. Temperature0.7 Max Tokens1000 Top P0.9 Frequency Penalty0 Presence Penalty0 Model Info Support Related Models --- Discover similar models you might be interested in [View all LLM Models](https://modelslab.com/models?feature=llmaster) [Q8](https://modelslab.com/models/together_ai/Qwen-Qwen3-8B-Base)[Together AI](https://modelslab.com/models/together_ai) [Qwen3 8B Base Closed Source Model](https://modelslab.com/models/together_ai/Qwen-Qwen3-8B-Base) [GG](https://modelslab.com/models/open_router/google-gemma-3n-e4b-it-free)[Open Router](https://modelslab.com/models/open_router) [Google: Gemma 3n 4B (free) Closed Source Model](https://modelslab.com/models/open_router/google-gemma-3n-e4b-it-free) [OG](https://modelslab.com/models/open_router/openai-gpt-oss-safeguard-20b)[Open Router](https://modelslab.com/models/open_router) [OpenAI: gpt-oss-safeguard-20b Closed Source Model](https://modelslab.com/models/open_router/openai-gpt-oss-safeguard-20b) [QN](https://modelslab.com/models/together_ai/Qwen-Qwen3-Next-80B-A3B-Instruct-FP8)[Together AI](https://modelslab.com/models/together_ai) [Qwen3 Next 80B A3b Instruct Fp8 Closed Source Model](https://modelslab.com/models/together_ai/Qwen-Qwen3-Next-80B-A3B-Instruct-FP8) [QC](https://modelslab.com/models/open_router/qwen-qwen-2.5-coder-32b-instruct)[Open Router](https://modelslab.com/models/open_router) [Qwen2.5 Coder 32B Instruct Closed Source Model](https://modelslab.com/models/open_router/qwen-qwen-2.5-coder-32b-instruct) [M(](https://modelslab.com/models/together_ai/mistralai-Mistral-7B-Instruct-v0.1)[Together AI](https://modelslab.com/models/together_ai) [Mistral (7B) Instruct v0.1 Closed Source Model](https://modelslab.com/models/together_ai/mistralai-Mistral-7B-Instruct-v0.1) [KK](https://modelslab.com/models/together_ai/moonshotai-Kimi-K2-Thinking)[Together AI](https://modelslab.com/models/together_ai) [Kimi K2 Thinking Closed Source Model](https://modelslab.com/models/together_ai/moonshotai-Kimi-K2-Thinking) [Q4](https://modelslab.com/models/together_ai/Qwen-Qwen3-4B-Instruct-2507)[Together AI](https://modelslab.com/models/together_ai) [Qwen3 4B Instruct 2507 Closed Source Model](https://modelslab.com/models/together_ai/Qwen-Qwen3-4B-Instruct-2507) [QV](https://modelslab.com/models/together_ai/Qwen-Qwen3-VL-8B-Instruct)[Together AI](https://modelslab.com/models/together_ai) [Qwen3-VL-8B-Instruct Closed Source Model](https://modelslab.com/models/together_ai/Qwen-Qwen3-VL-8B-Instruct) [QQ](https://modelslab.com/models/open_router/qwen-qwen3.5-9b)[Open Router](https://modelslab.com/models/open_router) [Qwen: Qwen3.5-9B Closed Source Model](https://modelslab.com/models/open_router/qwen-qwen3.5-9b) [IM](https://modelslab.com/models/open_router/inception-mercury)[Open Router](https://modelslab.com/models/open_router) [Inception: Mercury Closed Source Model](https://modelslab.com/models/open_router/inception-mercury) [![Anthropic: Claude Sonnet 4.5](https://images.stablediffusionapi.com/?Image=https://assets.modelslab.ai/generations/aae18a61-9b88-43f7-83f5-4ec4ead6d4b6.png)](https://modelslab.com/models/open_router/anthropic-claude-sonnet-4.5)[Open Router](https://modelslab.com/models/open_router) [Anthropic: Claude Sonnet 4.5 Closed Source Model](https://modelslab.com/models/open_router/anthropic-claude-sonnet-4.5) [OG](https://modelslab.com/models/open_router/openai-gpt-4o-extended)[Open Router](https://modelslab.com/models/open_router) [OpenAI: GPT-4o (extended) Closed Source Model](https://modelslab.com/models/open_router/openai-gpt-4o-extended) [QQ](https://modelslab.com/models/open_router/qwen-qwen3-8b)[Open Router](https://modelslab.com/models/open_router) [Qwen: Qwen3 8B Closed Source Model](https://modelslab.com/models/open_router/qwen-qwen3-8b) [XG](https://modelslab.com/models/open_router/x-ai-grok-3)[Open Router](https://modelslab.com/models/open_router) [xAI: Grok 3 Closed Source Model](https://modelslab.com/models/open_router/x-ai-grok-3) [QV](https://modelslab.com/models/together_ai/Qwen-Qwen3-VL-235B-A22B-Instruct-FP8)[Together AI](https://modelslab.com/models/together_ai) [Qwen3-VL-235B-A22B-Instruct-FP8 Closed Source Model](https://modelslab.com/models/together_ai/Qwen-Qwen3-VL-235B-A22B-Instruct-FP8) [M8](https://modelslab.com/models/together_ai/mistralai-Mixtral-8x22B-Instruct-v0.1)[Together AI](https://modelslab.com/models/together_ai) [Mixtral 8X22b Instruct V0.1 Closed Source Model](https://modelslab.com/models/together_ai/mistralai-Mixtral-8x22B-Instruct-v0.1) [M7](https://modelslab.com/models/together_ai/mistralai-Mistral-7B-v0.1)[Together AI](https://modelslab.com/models/together_ai) [Mistral 7B v0.1 Closed Source Model](https://modelslab.com/models/together_ai/mistralai-Mistral-7B-v0.1) About Z.Ai: GLM 5.1 --- GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks. Unlike previous models built around minute-level interactions, GLM-5.1 can work independently and continuously on... ### Technical Specifications Model IDz-ai-glm-5.1CategoryLLM ModelsTaskText GenerationPrice$2.050000 per million tokensAddedApril 7, 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 5.1 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-5.1", "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-5.1/api) for SDKs, code examples in Python, JavaScript, and more. ### Pricing Z.Ai: GLM 5.1 API costs $2.050000 per million tokens. Pay only for what you use with no minimum commitments. [View pricing plans](https://modelslab.com/pricing) ### Use Cases - AI chatbots and virtual assistants - Code generation and developer tools - Content writing and copywriting automation - Data analysis, summarization, and extraction [Learn more about Z.Ai: GLM 5.1](https://modelslab.com/zai-glm-51) [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 5.1 FAQ --- ### What is Z.Ai: GLM 5.1? GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks. Unlike previous models built around minute-level interactions, GLM-5.1 can work independently and continuously on... ### How do I use the Z.Ai: GLM 5.1 API? You can integrate Z.Ai: GLM 5.1 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-5.1" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation. ### How much does Z.Ai: GLM 5.1 cost? Z.Ai: GLM 5.1 costs $2.050000 per million tokens. ModelsLab uses pay-per-use pricing with no minimum commitments. A free tier is available to get started. ### What is the Z.Ai: GLM 5.1 model ID? The model ID for Z.Ai: GLM 5.1 is "z-ai-glm-5.1". Use this ID in your API requests to specify this model. ### Does Z.Ai: GLM 5.1 have a free tier? Yes, ModelsLab offers a free tier that lets you try Z.Ai: GLM 5.1 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*