xAI: Grok 4 API

Access xAI: Grok 4 from xAI using Puter.js AI API.

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Model Card

Grok 4 is xAI's flagship reasoning model released July 2025, trained with unprecedented reinforcement learning scale on 200,000 GPUs. It features native tool use, real-time search integration, and Grok 4 Heavy achieves 50% on Humanity's Last Exam benchmark.

Context Window N/A

tokens

Max Output N/A

tokens

Input Cost $3

per million tokens

Output Cost $15

per million tokens

Input text

modalities

Tool Use Yes

 

Knowledge Cutoff Jul 2025

 

Release Date Jul 9, 2025

 

API Usage Example

Add xAI: Grok 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: "x-ai/grok-4"
}).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-4"
        }).then(response => {
            document.body.innerHTML = response.message.content;
        });
    </script>
</body>
</html>

View full documentation →

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Frequently Asked Questions

What is this xAI: Grok 4 API about?

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

Who created xAI: Grok 4?

xAI: Grok 4 was created by xAI and released on Jul 9, 2025.

What is the knowledge cutoff of xAI: Grok 4?

xAI: Grok 4 has a knowledge cutoff date of Jul 2025. This means the model was trained on data available up to that date.

What types of input can xAI: Grok 4 process?

xAI: Grok 4 accepts the following input types: text. It produces: text.

Does xAI: Grok 4 support tool use (function calling)?

Yes, xAI: Grok 4 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 xAI: Grok 4 API is available through the User-Pays Model. As a developer, you can add the xAI: Grok 4 API to your app for free — your users pay for their own AI costs directly.
Price per 1M tokens
Input$3
Output$15
How do I access the xAI: Grok 4 API?

You can access the xAI: Grok 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 xAI: Grok 4 API work with React / Vue / Vanilla JS / Node / etc.?

Yes — the xAI: Grok 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 xAI: Grok 4 to your app without worrying about API keys or setup.

Read the Docs View Tutorials