---
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. Plans from $21/month.
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
type: product
component: Playground/LLM/Index
generated_at: 2026-09-11T04:25:45.076493Z
---

Z.ai: GLM 5.1
---

 [LLMs.txt](https://modelslab.com/models/z-ai/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
---

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

text files

Send

### Z.ai: GLM 5.1

z-ai z-ai-glm-5.1

Copy model ID

PricingInput $0.966 / 1M tokens

Output $3.036 / 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 Tokens4000

Top P0.9

Frequency Penalty0

Presence Penalty0

Thinkinglow

lowmediumhigh

Deeper thinking spends more of the Max Tokens budget before the answer starts.

Model Info

Support

Looking for something different?
---

Models that trade off differently against the one you are viewing

### Better quality

Newer flagship models that generally produce stronger results.

[![GPT 5.2](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/2bdd00f4-1692-49d8-a562-72cb1753d0ff.png)](https://modelslab.com/models/openai/gpt-5.2)[OpenAI](https://modelslab.com/models/openai)

 [GPT 5.2](https://modelslab.com/models/openai/gpt-5.2)

[![GPT 5.1](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/fad83520-47a8-4059-b4b9-b32adf4d0be7.png)](https://modelslab.com/models/openai/gpt5.1)[OpenAI](https://modelslab.com/models/openai)

 [GPT 5.1](https://modelslab.com/models/openai/gpt5.1)

[![Gemini 3 Pro Preview](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/1846e76f-9d5c-4a35-a43a-82db45b7bb8b.png)](https://modelslab.com/models/google/gemini-3-pro-preview)[Google](https://modelslab.com/models/google)

 [Gemini 3 Pro Preview](https://modelslab.com/models/google/gemini-3-pro-preview)

[![GPT-5.1-Codex-Max](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/06356c4c-df09-4ccb-a5c0-629da670f75b.png)](https://modelslab.com/models/openai/gpt-5.1-codex-max)[OpenAI](https://modelslab.com/models/openai)

 [GPT-5.1-Codex-Max](https://modelslab.com/models/openai/gpt-5.1-codex-max)

### Lower cost per run

Open-source models we host, unlimited on the $149/month plan.

[Modelslab: Custom LLM

Popular](https://modelslab.com/models/modelslab/uncensored-chat)[ModelsLab](https://modelslab.com/models/modelslab)

 [Modelslab: Custom LLM

Open Source Model](https://modelslab.com/models/modelslab/uncensored-chat)

[Qwen: Qwen3 235B A22B Instruct 2507](https://modelslab.com/models/qwen/qwen-qwen3-235b-a22b-2507)[Qwen](https://modelslab.com/models/open_router)

 [Qwen: Qwen3 235B A22B Instruct 2507

Closed Source Model](https://modelslab.com/models/qwen/qwen-qwen3-235b-a22b-2507)

[![Gemini 2.5 Flash](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/4fc6b09e-c7ae-4301-aed1-0b180b88157b.png)](https://modelslab.com/models/google/gemini-2.5-flash)[Google](https://modelslab.com/models/google)

 [Gemini 2.5 Flash

Closed Source Model](https://modelslab.com/models/google/gemini-2.5-flash)

[![gpt-oss-20b](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/8b2f0440-52cc-4f41-93eb-d31006ad71e2.webp)](https://modelslab.com/models/openai/gpt-oss-20b)[OpenAI](https://modelslab.com/models/openai)

 [gpt-oss-20b

Closed Source Model](https://modelslab.com/models/openai/gpt-oss-20b)

[![DeepSeek: DeepSeek V4 Flash 0423](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/267a7228-f392-4d3e-abb6-915fef640c49.png)](https://modelslab.com/models/deepseek/deepseek-deepseek-v4-flash)[DeepSeek](https://modelslab.com/models/open_router)

 [DeepSeek: DeepSeek V4 Flash 0423

Closed Source Model](https://modelslab.com/models/deepseek/deepseek-deepseek-v4-flash)

[![Google: Gemini 3.1 Flash Lite](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/05dab216-0dbb-4160-8e12-6c2984e61eea.png)](https://modelslab.com/models/google/google-gemini-3.1-flash-lite)[Google](https://modelslab.com/models/open_router)

 [Google: Gemini 3.1 Flash Lite

Closed Source Model](https://modelslab.com/models/google/google-gemini-3.1-flash-lite)

Related Models
---

Discover similar models you might be interested in

 [View all LLM Models](https://modelslab.com/models?feature=llmaster)

[#### OpenAI/OpenAI: gpt-oss-120b (batch)

openai-gpt-oss-120b-batch

From $0.38/M tokens](https://modelslab.com/models/openai/openai-gpt-oss-120b-batch)

[#### Anthropic/Anthropic: Claude Opus Latest

anthropic-claude-opus-latest

From $15.00/M tokens](https://modelslab.com/models/anthropic/anthropic-claude-opus-latest)

[#### Qwen/Qwen: Qwen3 30B A3B Thinking 2507

qwen-qwen3-30b-a3b-thinking-2507

From $1.30/M tokens](https://modelslab.com/models/qwen/qwen-qwen3-30b-a3b-thinking-2507)

[#### Qwen/Qwen: Qwen2.5 7B Instruct

qwen-qwen-2.5-7b-instruct

From $0.15/M tokens](https://modelslab.com/models/qwen/qwen-qwen-2.5-7b-instruct)

[#### Tencent/Tencent: Hy-MT2-30B-A3B

tencent-hy-mt2-30b-a3b

From $0.18/M tokens](https://modelslab.com/models/tencent/tencent-hy-mt2-30b-a3b)

[#### MiniMax/MiniMax: MiniMax M2.1

minimax-minimax-m2.1

From $0.75/M tokens](https://modelslab.com/models/minimax/minimax-minimax-m2.1)

[#### Qwen/Qwen: Qwen3 235B A22B Thinking 2507

qwen-qwen3-235b-a22b-thinking-2507

From $1.26/M tokens](https://modelslab.com/models/qwen/qwen-qwen3-235b-a22b-thinking-2507)

[#### Mistral AI/Mistral: Saba

mistralai-mistral-saba

From $0.40/M tokens](https://modelslab.com/models/mistralai/mistralai-mistral-saba)

[#### Anthropic/Anthropic: Claude Haiku 4.5

anthropic-claude-haiku-4.5

From $3.00/M tokens](https://modelslab.com/models/anthropic/anthropic-claude-haiku-4.5)

[#### Meta/Meta: Muse Spark 1.3 Contributor

meta-muse-spark-1.3-contributor

From $0.15/M tokens](https://modelslab.com/models/meta/meta-muse-spark-1.3-contributor)

[#### inclusionAI/inclusionAI: Ling 3.0 Flash Fin (free)

inclusionai-ling-3.0-flash-fin-free

Free](https://modelslab.com/models/inclusionai/inclusionai-ling-3.0-flash-fin-free)

[#### Mistral AI/Mistral: Mistral Small 3.2 24B

mistralai-mistral-small-3.2-24b-instruct

From $0.14/M tokens](https://modelslab.com/models/mistralai/mistralai-mistral-small-3.2-24b-instruct)

[#### Meta/Meta: Muse Glimmer 30B (batch)

meta-muse-glimmer-30b-batch

From $0.46/M tokens](https://modelslab.com/models/meta/meta-muse-glimmer-30b-batch)

[#### Moonshot AI/MoonshotAI: Kimi K2.7 Code

moonshotai-kimi-k2.7-code

From $2.10/M tokens](https://modelslab.com/models/moonshotai/moonshotai-kimi-k2.7-code)

[#### Google/Google: Nano Banana (Gemini 2.5 Flash Image)

google-gemini-2.5-flash-image

From $1.40/M tokens](https://modelslab.com/models/google/google-gemini-2.5-flash-image)

[#### OpenAI/OpenAI: GPT-4o-mini

openai-gpt-4o-mini

From $0.38/M tokens](https://modelslab.com/models/openai/openai-gpt-4o-mini)

[#### Google/Google: Gemini 2.5 Pro Preview 06-05

google-gemini-2.5-pro-preview

From $5.63/M tokens](https://modelslab.com/models/google/google-gemini-2.5-pro-preview)

[#### Tencent/Tencent: Hunyuan A13B Instruct

tencent-hunyuan-a13b-instruct

From $0.35/M tokens](https://modelslab.com/models/tencent/tencent-hunyuan-a13b-instruct)

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-5.1

CategoryLLM Models

TaskText Generation

Price$2 per million tokens

AddedApril 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

```
<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>
```

### Pricing

Z.Ai: GLM 5.1 API costs $2 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 per million tokens. ModelsLab plans start at $21/month (Basic), and the $149/month Open Source plan includes unlimited generation on open-source models.

### 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.

### Do I need a paid plan to use Z.Ai: GLM 5.1?

Yes. ModelsLab is subscription-based with no free tier — plans start at $21/month (Basic, 3,250 API calls). The $149/month Open Source Unlimited plan includes unlimited generation across open-source models; premium third-party models are billed per call from your wallet.

---

*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 - 2026-09-11*