xAI: Grok 4.1 Fast Non-Reasoning

Access Grok 4.1 Fast Non-Reasoning from xAI using Puter.js AI API.

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Model Card

Grok 4.1 Fast Non-Reasoning is the low-latency, non-reasoning variant of Grok 4.1 Fast that skips extended chain-of-thought for speed-critical applications. It shares the same model weights and 2M context window as Grok 4.1 Fast but delivers instant responses without deliberation overhead, ideal for real-time customer support and streaming interactions.

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 Nov 19, 2025

 

API Usage Example

Add Grok 4.1 Fast Non-Reasoning to your app with just a few lines of code.
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-4-1-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-4-1-fast-non-reasoning"
        }).then(response => {
            document.body.innerHTML = response.message.content;
        });
    </script>
</body>
</html>

# pip install openai
from openai import OpenAI

client = OpenAI(
    base_url="https://api.puter.com/puterai/openai/v1/",
    api_key="YOUR_PUTER_AUTH_TOKEN",
)

response = client.chat.completions.create(
    model="x-ai/grok-4-1-fast-non-reasoning",
    messages=[
        {"role": "user", "content": "Explain quantum computing in simple terms"}
    ],
)

print(response.choices[0].message.content)

curl https://api.puter.com/puterai/openai/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_PUTER_AUTH_TOKEN" \
  -d '{
    "model": "x-ai/grok-4-1-fast-non-reasoning",
    "messages": [
      {"role": "user", "content": "Explain quantum computing in simple terms"}
    ]
  }'

View full documentation →

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Grok 4.20 Multi-Agent Beta

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Grok 4.1 Fast

Grok 4.1 Fast is xAI's best tool-calling model released November 2025, featuring a 2M context window and halved hallucination rates versus Grok 4 Fast. It comes in reasoning and non-reasoning modes and is optimized for agentic workflows with native support for web search, X search, and code execution.

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Frequently Asked Questions

How do I use Grok 4.1 Fast Non-Reasoning?

You can access Grok 4.1 Fast Non-Reasoning by xAI through Puter.js AI API. Include the library in your web app or Node.js project and start making calls with just a few lines of JavaScript — no backend and no configuration required. You can also use it with Python or cURL via Puter's OpenAI-compatible API.

Is Grok 4.1 Fast Non-Reasoning free?

Yes, it is free if you're using it through Puter.js. With the User-Pays Model, you can add Grok 4.1 Fast Non-Reasoning to your app at no cost — your users pay for their own AI usage directly, making it completely free for you as a developer.

What is the pricing for Grok 4.1 Fast Non-Reasoning?
Pricing for Grok 4.1 Fast Non-Reasoning is based on the number of input and output tokens used per request.
Price per 1M tokens
Input$0.2
Output$0.5
Who created Grok 4.1 Fast Non-Reasoning?

Grok 4.1 Fast Non-Reasoning was created by xAI and released on Nov 19, 2025.

What is the max output length of Grok 4.1 Fast Non-Reasoning?

Grok 4.1 Fast Non-Reasoning can generate up to 2M tokens in a single response.

What is the knowledge cutoff of Grok 4.1 Fast Non-Reasoning?

Grok 4.1 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 Grok 4.1 Fast Non-Reasoning process?

Grok 4.1 Fast Non-Reasoning accepts the following input types: text, image. It produces: text.

Does Grok 4.1 Fast Non-Reasoning support tool use (function calling)?

Yes, Grok 4.1 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.

Does it work with React / Vue / Vanilla JS / Node / etc.?

Yes — the Grok 4.1 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 Grok 4.1 Fast Non-Reasoning to your app without worrying about API keys or setup.

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