Fast Grok model for responsive chat, reasoning, and tool-assisted work
Grok 4 Fast by xai is offered by 2 providers on this page. Public prices are shown for 1 of them. Its reference price is $0.20 per 1M input tokens and $0.50 per 1M output tokens.
The context window is 2,000,000 tokens, with an output limit of 64,000 tokens. It supports reasoning and tool use. Accepted input modalities are Text, Image, Audio, and Video. Its training knowledge cuts off at 2025-01-01.
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
1 / 2 providers expose no reasoning control (reasoning_options: []).