xAI: Grok 4 Fast Non-Reasoning API

Access xAI: Grok 4 Fast Non-Reasoning from xAI using Puter.js AI API.

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Model Card

Grok 4 Fast Non-Reasoning is the speed-optimized, non-reasoning variant of Grok 4 Fast that bypasses extended chain-of-thought for instant responses. It uses the same unified architecture with a 2M context window but skips deliberation, delivering up to 342 tokens/second throughput for high-volume, latency-sensitive applications.

Context Window N/A

tokens

Max Output 2M

tokens

Input Cost $0.2

per million tokens

Output Cost $0.5

per million tokens

Input text, image

modalities

Tool Use Yes

 

Knowledge Cutoff Jul 2025

 

Release Date Sep 19, 2025

 

API Usage Example

Add xAI: Grok 4 Fast Non-Reasoning 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-fast-non-reasoning"
}).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-fast-non-reasoning"
        }).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 Fast Non-Reasoning API about?

The xAI: Grok 4 Fast Non-Reasoning 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 Fast Non-Reasoning into any web app or Node.js project — no API keys, no backend, and no configuration required.

Who created xAI: Grok 4 Fast Non-Reasoning?

xAI: Grok 4 Fast Non-Reasoning was created by xAI and released on Sep 19, 2025.

What is the max output length of xAI: Grok 4 Fast Non-Reasoning?

xAI: Grok 4 Fast Non-Reasoning can generate up to 2M tokens in a single response.

What is the knowledge cutoff of xAI: Grok 4 Fast Non-Reasoning?

xAI: Grok 4 Fast Non-Reasoning 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 Fast Non-Reasoning process?

xAI: Grok 4 Fast Non-Reasoning accepts the following input types: text, image. It produces: text.

Does xAI: Grok 4 Fast Non-Reasoning support tool use (function calling)?

Yes, xAI: Grok 4 Fast Non-Reasoning 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 Fast Non-Reasoning API is available through the User-Pays Model. As a developer, you can add the xAI: Grok 4 Fast Non-Reasoning API to your app for free — your users pay for their own AI costs directly.
Price per 1M tokens
Input$0.2
Output$0.5
How do I access the xAI: Grok 4 Fast Non-Reasoning API?

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

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

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