Using Grok 4.1 Fast on OpenRouter

Quick Start

1. 1
   Create an account at OpenRouter and generate an API key.
2. 2
   Use the OpenRouter SDK or REST API to call x-ai/grok-4.1-fast — see the documentation for request format.
3. 3
   You'll be billed $0.20/1M input, $0.50/1M output tokens. See full pricing.

About OpenRouter

OpenRouter provides a unified interface for Large Language Models with better pricing, improved uptime, and no subscription requirements. Route across providers for cost optimization and reliability.

Multi-provider LLM aggregator offering unified API access to 300+ models from all major labs and emerging providers, with automatic failover for reliability.

Pricing on OpenRouter

Capabilities

About Grok 4.1 Fast

Ultra-low latency variant of Grok 4.1 for real-time and high-throughput applications. Reasons automatically; does not support the reasoning.effort parameter (returns error if specified). Text-only. Context window is 1,048,576 tokens. API ID: grok-4-1-fast.