Fast Grok model for responsive chat, reasoning, and tool-assisted work
grok-4-fast-reasoning by xai is offered by 5 providers on this page. Public prices are shown for 4 of them. Its reference price is $0.20 per 1M input tokens and $0.50 per 1M output tokens.
Artificial Analysis rates it 17.9 on the Intelligence Index. Against its lowest blended price of $0.247 per 1M, that is roughly 72 index points per dollar, which is the value ratio the leaderboards rank on.
The context window is 2,000,000 tokens, with an output limit of 2,000,000 tokens. It supports reasoning, tool use, and structured output. Accepted input modalities are Text, Image, Audio, and Video. Providers report the capability flags inconsistently, so verify a specific feature against the host you plan to use. Its training knowledge cuts off at 2025-06.
Quality is independently evaluated by Artificial Analysis. Speed/latency are model-level medians.
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| Jiekou.AI | Gateway | $0.18 | $0.45 | — | — | 2,000,000 | 2,000,000 | |
| Poe | Gateway | $0.20 | $0.50 | $0.05 | — | 2,000,000 | 128,000 | |
| 302.AI | Gateway | $0.20 | $0.50 | — | — | 2,000,000 | 30,000 | |
| Helicone | Gateway | $0.20 | $0.50 | $0.05 | — | 2,000,000 | 2,000,000 | |
| Qiniu | Gateway | — | — | — | — | 2,000,000 | 2,000,000 | hostTable.undisclosed |
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.
4 / 5 providers expose no reasoning control (reasoning_options: []).
Individual evaluations run by Artificial Analysis, on the same reasoning tier as the intelligence score above. Each benchmark has its own task set and harness, so rows are not comparable with one another. The Intelligence Index above draws on a different, newer set of evaluations.