How much does grok-4-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-fast-reasoning:free via API?

Send requests to the UnoRouter /v1/chat/completions endpoint with model=grok-4-fast-reasoning:free. Any OpenAI-compatible client library works. Authentication uses a standard Bearer token.

xAI: grok-4-fast-reasoning:free

Name: grok-4-fast-reasoning:free
Brand: xAI

grok-4-fast-reasoning:free

2M context131.1K outReasoningToolsVisionFilesStructuredWeb search

Released Aug 27, 2025Knowledge cutoff 2024Updated Aug 27, 2025

A speed-optimized variant of Grok-4 designed for complex, multi-step logical problems. It utilizes a "reasoning-first" approach with visible thinking tokens, delivering near-frontier intelligence in science, finance, and coding at significantly lower latency.

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