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

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.

<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>

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Get started with Puter.js

Add xAI: Grok 4 to your app without worrying about API keys or setup.

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