Qwen3 4B API

Access Qwen3 4B from Qwen using Puter.js AI API.

Get Started

Model Card

Qwen3 4B is a compact model rivaling Qwen2.5-72B-Instruct performance, featuring hybrid thinking modes and 119 language support.

Context Window N/A

tokens

Max Output N/A

tokens

Input Cost $0

per million tokens

Output Cost $0

per million tokens

Release Date Apr 29, 2025

 

API Usage Example

Add Qwen3 4B to your app with just a few lines of code.
No API keys, no backend, no configuration required.

// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';

puter.ai.chat("Explain quantum computing in simple terms", {
    model: "qwen/qwen3-4b:free"
}).then(response => {
    document.body.innerHTML = response.message.content;
});

<html>
<body>
    <script src="https://js.puter.com/v2/"></script>
    <script>
        puter.ai.chat("Explain quantum computing in simple terms", {
            model: "qwen/qwen3-4b:free"
        }).then(response => {
            document.body.innerHTML = response.message.content;
        });
    </script>
</body>
</html>

View full documentation →

More Models from Qwen

Chat

Qwen3.5 397B A17B

Qwen3.5-397B-A17B is an open-weight native vision-language model from Alibaba's Qwen team, released ...

 Chat

Qwen3.5 Plus 02-15

Qwen3.5-Plus is the hosted flagship model in the Qwen3.5 series, available through Alibaba Cloud Mod...

 Chat

Qwen3 Max Thinking

Qwen3 Max Thinking is Alibaba Cloud's flagship proprietary reasoning model with a 256K context windo...

View all Qwen models →

Frequently Asked Questions

What is this Qwen3 4B API about?

The Qwen3 4B API gives you access to Qwen's chat model through Puter.js. With just a few lines of JavaScript, you can integrate Qwen3 4B into any web app or Node.js project — no API keys, no backend, and no configuration required.

Who created Qwen3 4B?

Qwen3 4B was created by Qwen and released on Apr 29, 2025.

How much does it cost?
The Qwen3 4B API is available through the User-Pays Model. As a developer, you can add the Qwen3 4B API to your app for free — your users pay for their own AI costs directly.
Price per 1M tokens
Input$0
Output$0
How do I access the Qwen3 4B API?

You can access the Qwen3 4B API with just a few lines of JavaScript — no API keys, no backend, and no configuration required. Include the Puter.js library in your project and start making calls right away. For more details, check out our documentation.

Does the Qwen3 4B API work with React / Vue / Vanilla JS / Node / etc.?

Yes — the Qwen3 4B API works with any JavaScript framework, Node.js, or plain HTML through Puter.js. Just include the library and start building. See the documentation for more details.

Get started with Puter.js

Add Qwen3 4B to your app without worrying about API keys or setup.

Read the Docs View Tutorials