Qwen: Qwen3 4B

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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

 

Code Example

Add AI to your app with the Puter.js AI API — no API keys or setup required.

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

puter.ai.chat("Explain quantum computing in simple terms").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").then(response => {
            document.body.innerHTML = response.message.content;
        });
    </script>
</body>
</html>

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Qwen3.5 Plus 2026-04-20

Qwen3.5 Plus is a proprietary hosted model from Alibaba, built on the Qwen3.5-397B-A17B Mixture-of-Experts architecture with 397 billion total parameters and 17 billion active per token. Its headline feature is a 1-million-token native context window — among the largest available via API — making it well suited for processing entire codebases, long documents, or extended multi-turn conversations in a single request. It supports both a deep-thinking mode and an "Auto" mode that adaptively invokes tools like web search and code interpreters. This April 20, 2026 snapshot reflects ongoing improvements to the model since its original February 2026 launch. The Qwen3.5 series demonstrated strong multimodal performance across reasoning, coding, and vision tasks. A solid general-purpose option for developers needing large-context capabilities without migrating to the newer Qwen3.6 line.

Frequently Asked Questions

How do I use Qwen3 4B?

You can access Qwen3 4B by Qwen through Puter.js AI API. Include the library in your web app or Node.js project and start making calls with just a few lines of JavaScript — no backend and no configuration required. You can also use it with Python or cURL via Puter's OpenAI-compatible API.

Is Qwen3 4B free?

Yes, it is free if you're using it through Puter.js. With the User-Pays Model, you can add Qwen3 4B to your app at no cost — your users pay for their own AI usage directly, making it completely free for you as a developer.

What is the pricing for Qwen3 4B?
Qwen3 4B costs $0 per 1M input tokens and $0 per 1M output tokens.
Price per 1M tokens
Input$0
Output$0
Who created Qwen3 4B?

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

Does it 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.

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