---
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-frontend-v2-927501783998.us-east4.run.app/models/z-ai/z-ai-glm-5.1.md
canonical: https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/z-ai/z-ai-glm-5.1.md
type: product
component: Playground/LLM/Index
generated_at: 2026-05-13T09:45:15.977530Z
---

Z.ai: GLM 5.1
---

 [LLMs.txt](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router/z-ai-glm-5.1/llms.txt) [.md](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/z-ai/z-ai-glm-5.1.md)

z-ai-glm-5.1 z-ai Closed Source Model $2.275000 / call

Z.ai: GLM 5.1
---

Choose a prompt below to get started or type your own message

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### Z.ai: GLM 5.1

z-ai z-ai-glm-5.1

Copy model ID

PricingInput $1.05 / 1M tokens

Output $3.50 / 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

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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$2.275000 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-frontend-v2-927501783998.us-east4.run.app/pricing) to get started.

PythonJavaScriptcURLPHP

```
<code>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}")</code>
```

View the [full API documentation](https://modelslab-frontend-v2-927501783998.us-east4.run.app/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 $2.275000 per million tokens. Pay only for what you use with no minimum commitments. [View pricing plans](https://modelslab-frontend-v2-927501783998.us-east4.run.app/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-frontend-v2-927501783998.us-east4.run.app/zai-glm-51) [Browse LLM Models](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models?feature=llmaster) [More from Z Ai](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/open_router) [View Pricing](https://modelslab-frontend-v2-927501783998.us-east4.run.app/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 $2.275000 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 - 2026-05-13*