Description
Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window. Reasoning can be enabled/disabled using the `reasoning` `enabled` parameter in the API. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#controlling-reasoning-tokens)
API Usage Examples
OpenAI Compatible Endpoint
Use this endpoint with any OpenAI-compatible library. Model: xAI: Grok 4.1 Fast (x-ai/grok-4.1-fast)
curl https://api.ridvay.com/v1/chat/completions -H "Content-Type: application/json" -H "Authorization: Bearer YOUR_API_KEY" -d '{
"model": "x-ai/grok-4.1-fast",
"messages": [
{
"role": "user",
"content": "Explain the capabilities of the xAI: Grok 4.1 Fast model"
}
],
"temperature": 0.7,
"max_tokens": 1024
}'Supported Modalities
- Text
- Images
API Pricing
- Input: 0.2$ / 1M tokens
- Output: 0.5$ / 1M tokens
Token Limits
- Max Output: 30,000 tokens
- Max Context: 2,000,000 tokens
Subscription Tiers
- free
- pro
- ultimate