Grok 3 Mini Fast API

Access Grok 3 Mini Fast from xAI using Puter.js AI API.

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Model Card

Grok 3 Mini Fast is the speed-optimized variant of Grok 3 Mini, running on faster infrastructure for significantly quicker response times. It provides identical reasoning quality to Grok 3 Mini but is designed for latency-sensitive applications.

Context Window 131K

tokens

Max Output 131K

tokens

Input Cost $0.6

per million tokens

Output Cost $4

per million tokens

Input text

modalities

Tool Use Yes

 

Knowledge Cutoff Nov 2024

 

Release Date Feb 17, 2025

 

API Usage Example

Add Grok 3 Mini Fast 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: "x-ai/grok-3-mini-fast"
}).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: "x-ai/grok-3-mini-fast"
        }).then(response => {
            document.body.innerHTML = response.message.content;
        });
    </script>
</body>
</html>

View full documentation →

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Frequently Asked Questions

What is this Grok 3 Mini Fast API about?

The Grok 3 Mini Fast API gives you access to xAI's chat model through Puter.js. With just a few lines of JavaScript, you can integrate Grok 3 Mini Fast into any web app or Node.js project — no API keys, no backend, and no configuration required.

Who created Grok 3 Mini Fast?

Grok 3 Mini Fast was created by xAI and released on Feb 17, 2025.

What is the context window of Grok 3 Mini Fast?

Grok 3 Mini Fast supports a context window of 131K tokens. For reference, that is roughly equivalent to 262 pages of text.

What is the max output length of Grok 3 Mini Fast?

Grok 3 Mini Fast can generate up to 131K tokens in a single response.

What is the knowledge cutoff of Grok 3 Mini Fast?

Grok 3 Mini Fast has a knowledge cutoff date of Nov 2024. This means the model was trained on data available up to that date.

What types of input can Grok 3 Mini Fast process?

Grok 3 Mini Fast accepts the following input types: text. It produces: text.

Does Grok 3 Mini Fast support tool use (function calling)?

Yes, Grok 3 Mini Fast supports tool use (function calling), allowing it to interact with external tools, APIs, and data sources as part of its response flow.

How much does it cost?
The Grok 3 Mini Fast API is available through the User-Pays Model. As a developer, you can add the Grok 3 Mini Fast API to your app for free — your users pay for their own AI costs directly.
Price per 1M tokens
Input$0.6
Output$4
How do I access the Grok 3 Mini Fast API?

You can access the Grok 3 Mini Fast 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 Grok 3 Mini Fast API work with React / Vue / Vanilla JS / Node / etc.?

Yes — the Grok 3 Mini Fast 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 Grok 3 Mini Fast to your app without worrying about API keys or setup.

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