Introducing Grok-4-Fast: Blazing Speed and Multimodal Power on Neosantara

Er Rickow· October 2, 2025

We are thrilled to announce that Grok-4-Fast, one of the most cost-efficient and capable models on the market, is now available on the Neosantara AI platform. Get ready to experience a new level of performance for your applications, combining incredible speed, multimodal understanding, and a massive context window.

What is Grok-4-Fast?

Grok-4-Fast is xAI's latest multimodal model, engineered for top-tier cost-efficiency. It's not just another language model; it's a versatile powerhouse designed for a new generation of AI applications.

Unleash the speed of Grok-4-Fast for your projects.

Key Features You'll Love

1. Blazing Speed: As the name suggests, this model is fast. It's optimized for high-throughput tasks, making it perfect for real-time chat, content generation, and interactive applications.
2. Multimodal Capabilities: Grok-4-Fast can understand both text and images in a single prompt. You can now build applications that analyze visual data, describe what's in a picture, or answer questions about an image.
3. Massive Context Window: With support for up to 2 million tokens, you can process and reason over huge amounts of text, from entire codebases to lengthy documents.
4. Native Reasoning: Activate the model's advanced reasoning capabilities with a simple parameter, allowing it to "think" step-by-step for more complex problems.

Try Grok-4-Fast for Free on Neosantara

The best way to experience Grok-4-Fast is to try it yourself. At Neosantara, we believe in making powerful AI accessible. That's why every user on our Free Tier can access grok-4-fast right now.

When you sign up, you get a generous monthly quota of tokens that you can use across any of our available models, including this one. This gives you the freedom to experiment and build prototypes without any upfront cost.

How to Use Grok-4-Fast

Integrating Grok-4-Fast is as simple as making a standard API call. Just specify "grok-4-fast" as your model.

Here’s a quick example in Python to get you started:

# Make sure you have the openai library installed: pip install openai
import openai

client = openai.OpenAI(
  baseURL="https://api.neosantara.xyz/v1",
  apiKey="<YOUR_NEOSANTARA_API_KEY>",
)

completion = client.chat.completions.create(
  model="grok-4-fast",
  messages=[
    {
      "role": "user",
      "content": "What is in this image?",
    },
    {
      "type": "image_url",
      "image_url": {
        "url": "https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Gfp-wisconsin-madison-the-nature-boardwalk.jpg/2560px-Gfp-wisconsin-madison-the-nature-boardwalk.jpg"
      }
    }
  ]
)

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