---
title: Qwen3 4B Base API | Text Generation | ModelsLab
description: Build with Qwen3 4B Base API by Qwen. Text generation, chat, code, and reasoning. Pay-per-use. Free tier.
url: https://modelslab.com/models/Qwen/qwen-qwen3-4b-base.md
canonical: https://modelslab.com/models/Qwen/qwen-qwen3-4b-base.md
type: product
component: Playground/LLM/Index
generated_at: 2026-05-05T21:47:53.864805Z
---

Qwen3 4B Base
---

 [LLMs.txt](https://modelslab.com/models/together_ai/Qwen-Qwen3-4B-Base/llms.txt) [.md](https://modelslab.com/models/Qwen/Qwen-Qwen3-4B-Base.md)

Qwen-Qwen3-4B-Base Qwen Closed Source Model

Qwen3 4B Base
---

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

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### Qwen3 4B Base

Qwen Qwen-Qwen3-4B-Base

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.

Temperature0.7

Max Tokens1000

Top P0.9

Frequency Penalty0

Presence Penalty0

Model Info

Support

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About Qwen3 4B Base
---

Qwen3 4B Base is a text generation AI model by Qwen available on ModelsLab. Access Qwen3 4B Base through our API with pay-per-use pricing and no minimum commitments.

### Technical Specifications

Model IDQwen-Qwen3-4B-BaseCategoryLLM ModelsTaskText GenerationAddedApril 6, 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 Qwen3 4B Base 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": "Qwen-Qwen3-4B-Base",
        "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.com/models/Qwen/Qwen-Qwen3-4B-Base/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 Qwen](https://modelslab.com/models/open_router) [View Pricing](https://modelslab.com/pricing)

Qwen3 4B Base FAQ
---

### What is Qwen3 4B Base?

Qwen3 4B Base is a text generation AI model by Qwen available on ModelsLab. Access it through our API with pay-per-use pricing and no minimum commitments.

### How do I use the Qwen3 4B Base API?

You can integrate Qwen3 4B Base into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "Qwen-Qwen3-4B-Base" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation.

### What is the Qwen3 4B Base model ID?

The model ID for Qwen3 4B Base is "Qwen-Qwen3-4B-Base". Use this ID in your API requests to specify this model.

### Does Qwen3 4B Base have a free tier?

Yes, ModelsLab offers a free tier that lets you try Qwen3 4B Base 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 - 2026-05-06*