> ## Documentation Index
> Fetch the complete documentation index at: https://doc.starrise.tech/llms.txt
> Use this file to discover all available pages before exploring further.

# Grok 4 Fast Reasoning

> Call xAI Grok 4 Fast Reasoning via Starrise AI API. Grok 4 reasoning variant.

Grok 4 Fast Reasoning is xAI's language model, available through Starrise AI. Grok 4 reasoning variant.

## Key Capabilities

* **OpenAI-compatible** — Use directly with the OpenAI SDK
* **Streaming** — Supports real-time SSE streaming
* **Strong reasoning** — Suitable for complex, multi-step tasks

## Quick Example

<CodeGroup>
  ```bash cURL theme={null}
  curl https://ai.alad.com/v1/chat/completions \
    -H "Authorization: Bearer YOUR_API_KEY" \
    -H "Content-Type: application/json" \
    -d '{
      "model": "grok-4-fast-reasoning",
      "messages": [
        { "role": "user", "content": "Explain quantum entanglement in simple terms." }
      ]
    }'
  ```

  ```python Python theme={null}
  from openai import OpenAI

  client = OpenAI(
      api_key="YOUR_API_KEY",
      base_url="https://ai.alad.com/v1"
  )

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

  print(response.choices[0].message.content)
  ```
</CodeGroup>

## Parameters

| Parameter     | Type    | Required | Description                               |
| ------------- | ------- | -------- | ----------------------------------------- |
| `model`       | string  | Yes      | Fixed value: `grok-4-fast-reasoning`      |
| `messages`    | array   | Yes      | List of `{ role, content }` objects       |
| `max_tokens`  | integer | No       | Maximum number of tokens to generate      |
| `temperature` | float   | No       | `0`–`2`, controls randomness, default `1` |
| `stream`      | boolean | No       | Enable SSE streaming, default `false`     |
| `top_p`       | float   | No       | Nucleus sampling threshold                |

<Card title="API Reference" icon="code" href="/en/api-reference/model-api/xai/grok-4-fast-reasoning">
  View the interactive API Playground for Grok 4 Fast Reasoning.
</Card>