How much does grok-4.1-fast-reasoning:free cost per 1M tokens?

Input is priced at $0.00 per 1M tokens, output at $0.00 per 1M tokens. Billing is per token, no rounding to batch sizes.

How do I access grok-4.1-fast-reasoning:free via API?

Send requests to the UnoRouter /v1/chat/completions endpoint with model=grok-4.1-fast-reasoning:free. Any OpenAI-compatible client library works. Authentication uses a standard Bearer token.

xAI: grok-4.1-fast-reasoning:free

Name: grok-4.1-fast-reasoning:free
Brand: xAI

grok-4.1-fast-reasoning:free

2M context131.1K outReasoningToolsVisionFilesStructuredWeb search

Released Nov 16, 2025Knowledge cutoff 2024Updated Nov 16, 2025

A next-generation agentic reasoning model from xAI, optimized for high-speed tool-calling and complex multi-step planning. It features a massive 2M context window and enhanced emotional intelligence, achieving near-frontier reasoning performance (matching o3) at a fraction of the cost.

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