---
title: GLM 5.1 FP4 API | Text Generation | ModelsLab
description: Build with GLM 5.1 FP4 API by Z.ai. Text generation, chat, code, and reasoning. Plans from $21/month.
url: https://modelslab.com/models/zai-org/zai-org-glm-5.1.md
canonical: https://modelslab.com/models/zai-org/zai-org-glm-5.1
type: product
component: Playground/LLM/Index
generated_at: 2026-07-28T09:07:40.249765Z
---

GLM 5.1 FP4
---

 [LLMs.txt](https://modelslab.com/models/zai-org/zai-org-GLM-5.1/llms.txt) [.md](https://modelslab.com/models/zai-org/zai-org-GLM-5.1.md)

GLM 5.1 FP4
---

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

### GLM 5.1 FP4

zai-org zai-org-GLM-5.1

Copy model ID

PricingInput $1.40 / 1M tokens

Output $4.40 / 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

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

Closed Source Model](https://modelslab.com/models/openai/gpt-5.2)

[![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

Closed Source Model](https://modelslab.com/models/google/gemini-3-pro-preview)

[![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

Closed Source Model](https://modelslab.com/models/openai/gpt5.1)

[![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

Closed Source Model](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.

[MC

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)

[![Gemini 2.0 Flash](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/f05a6bc4-dd20-49cc-bc2f-8a1c9b25e930.png)](https://modelslab.com/models/google/gemini-2.0-flash-001)[Google](https://modelslab.com/models/google)

 [Gemini 2.0 Flash

Closed Source Model](https://modelslab.com/models/google/gemini-2.0-flash-001)

[![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)

[QQ](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)

[![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](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

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

Related Models
---

Discover similar models you might be interested in

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

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

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

From $0.20/M tokens](https://modelslab.com/models/mistralai/mistralai-mistral-small-3.2-24b-instruct)

[#### Anthropic/Claude Opus 5 (Fast)

anthropic-claude-opus-5-fast

From $30.00/M tokens](https://modelslab.com/models/anthropic/anthropic-claude-opus-5-fast)

[#### Z.ai/Z.ai: GLM 4.7 Flash

z-ai-glm-4.7-flash

From $0.23/M tokens](https://modelslab.com/models/z-ai/z-ai-glm-4.7-flash)

[#### Qwen/Qwen: Qwen3 Coder 480B A35B

qwen-qwen3-coder

From $0.65/M tokens](https://modelslab.com/models/qwen/qwen-qwen3-coder)

[#### Mistral AI/Mistral: Mistral Small 3.1 24B

mistralai-mistral-small-3.1-24b-instruct

From $0.45/M tokens](https://modelslab.com/models/mistralai/mistralai-mistral-small-3.1-24b-instruct)

[#### Qwen/Qwen: Qwen Plus 0728 (thinking)

qwen-qwen-plus-2025-07-28-thinking

From $0.52/M tokens](https://modelslab.com/models/qwen/qwen-qwen-plus-2025-07-28-thinking)

[#### Mistral AI/Mistral: Voxtral Small 24B 2507

mistralai-voxtral-small-24b-2507

From $0.20/M tokens](https://modelslab.com/models/mistralai/mistralai-voxtral-small-24b-2507)

[#### Nous Research/Nous: Hermes 4 70B

nousresearch-hermes-4-70b

From $0.27/M tokens](https://modelslab.com/models/nousresearch/nousresearch-hermes-4-70b)

[#### Mistral AI/Mistral: Mistral Medium 3.1

mistralai-mistral-medium-3.1

From $1.20/M tokens](https://modelslab.com/models/mistralai/mistralai-mistral-medium-3.1)

[#### Mistral AI/Mistral: Mistral Small 3

mistralai-mistral-small-24b-instruct-2501

From $0.07/M tokens](https://modelslab.com/models/mistralai/mistralai-mistral-small-24b-instruct-2501)

[#### Deepcogito/Deep Cogito: Cogito v2.1 671B

deepcogito-cogito-v2.1-671b

From $1.25/M tokens](https://modelslab.com/models/deepcogito/deepcogito-cogito-v2.1-671b)

[#### Qwen/Qwen2-VL (72B) Instruct

Qwen-Qwen2-VL-72B-Instruct

From $1.20/M tokens](https://modelslab.com/models/qwen/Qwen-Qwen2-VL-72B-Instruct)

[#### ByteDance Seed/ByteDance Seed: Seed-2.0-Lite

bytedance-seed-seed-2.0-lite

From $1.13/M tokens](https://modelslab.com/models/bytedance-seed/bytedance-seed-seed-2.0-lite)

[#### Arcee AI/Arcee AI: Trinity Large Thinking

arcee-ai-trinity-large-thinking

From $0.54/M tokens](https://modelslab.com/models/arcee-ai/arcee-ai-trinity-large-thinking)

[#### Google/Google: Gemini 3.1 Flash Lite Preview

google-gemini-3.1-flash-lite-preview

From $0.88/M tokens](https://modelslab.com/models/google/google-gemini-3.1-flash-lite-preview)

[#### Aion Labs/AionLabs: Aion-2.0

aion-labs-aion-2.0

From $1.20/M tokens](https://modelslab.com/models/aion-labs/aion-labs-aion-2.0)

[#### Meta/Meta: Llama 3.2 1B Instruct

meta-llama-llama-3.2-1b-instruct

From $0.11/M tokens](https://modelslab.com/models/meta/meta-llama-llama-3.2-1b-instruct)

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

tencent-hunyuan-a13b-instruct

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

About GLM 5.1 FP4
---

GLM 5.1 FP4 is a text generation AI model by Z.ai available on ModelsLab. Access GLM 5.1 FP4 through our API with pay-per-use pricing and no minimum commitments.

### Technical Specifications

Model IDzai-org-GLM-5.1

CategoryLLM Models

TaskText Generation

Price$2.9 per million tokens

AddedMay 21, 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 GLM 5.1 FP4 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": "zai-org-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

GLM 5.1 FP4 API costs $2.900000 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

[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)

GLM 5.1 FP4 FAQ
---

### What is GLM 5.1 FP4?

GLM 5.1 FP4 is a text generation AI model by Z.ai available on ModelsLab. Access it through our API with pay-per-use pricing and no minimum commitments.

### How do I use the GLM 5.1 FP4 API?

You can integrate GLM 5.1 FP4 into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "zai-org-GLM-5.1" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation.

### How much does GLM 5.1 FP4 cost?

GLM 5.1 FP4 costs $2.900000 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 GLM 5.1 FP4 model ID?

The model ID for GLM 5.1 FP4 is "zai-org-GLM-5.1". Use this ID in your API requests to specify this model.

### Do I need a paid plan to use GLM 5.1 FP4?

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 - 2026-07-28*