Mistral Small 4 API

Access Mistral Small 4 from Mistral AI using Puter.js AI API.

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Model Card

Mistral Small 4 is a 119B-parameter open-source Mixture-of-Experts model (6B active per token) released under Apache 2.0, unifying instruction-following, reasoning, multimodal (text + image), and agentic coding into a single deployment. It features 128 experts, a 256k context window, and configurable reasoning effort that lets developers toggle between fast responses and deep step-by-step reasoning per request. Compared to its predecessor Mistral Small 3, it delivers 40% lower latency and 3x higher throughput while matching or surpassing GPT-OSS 120B on key benchmarks.

Context Window N/A

tokens

Max Output 256K

tokens

Input Cost $0.15

per million tokens

Output Cost $0.6

per million tokens

Release Date Mar 16, 2026

 

API Usage Example

Add Mistral Small 4 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: "mistralai/mistral-small-2603"
}).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: "mistralai/mistral-small-2603"
        }).then(response => {
            document.body.innerHTML = response.message.content;
        });
    </script>
</body>
</html>

View full documentation →

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Frequently Asked Questions

What is this Mistral Small 4 API about?

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

Who created Mistral Small 4?

Mistral Small 4 was created by Mistral AI and released on Mar 16, 2026.

What is the max output length of Mistral Small 4?

Mistral Small 4 can generate up to 256K tokens in a single response.

How much does it cost?
The Mistral Small 4 API is available through the User-Pays Model. As a developer, you can add the Mistral Small 4 API to your app for free — your users pay for their own AI costs directly.
Price per 1M tokens
Input$0.15
Output$0.6
How do I access the Mistral Small 4 API?

You can access the Mistral Small 4 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 Mistral Small 4 API work with React / Vue / Vanilla JS / Node / etc.?

Yes — the Mistral Small 4 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 Mistral Small 4 to your app without worrying about API keys or setup.

Read the Docs View Tutorials