Grok 4 vs Grok 4 Fast Reasoning
Data reconciled September 29, 2026
Short answer
Grok 4 and Grok 4 Fast Reasoning each win on different axes — neither is simply cheaper or better across the board.
Grok 4 Fast Reasoning holds a 7.8× larger context window.
Grok 4 Fast Reasoning returns a 7.8× longer answer per call.
Side by side
| Parameter | Grok 4 | Grok 4 Fast Reasoning |
|---|---|---|
| Provider | xAI | xAI |
| Input, $ per 1M tokens | $1.25 | $1.25 |
| Output, $ per 1M tokens | $2.50 | $2.50 |
| Cache read, $ per 1M | $0.20 | $0.20 |
| Context window | 256,000 | 2,000,000 |
| Max output | 256,000 | 2,000,000 |
| Vision | no | no |
| Tools | yes | yes |
| Reasoning | no | no |
| Status | available | available |
What it costs on your own workload
A price gap per million tokens says little until your volumes are plugged in: on a long fixed system prompt the winner is the model with cheap cache reads, not the one with a cheap input rate. Run Grok 4 and Grok 4 Fast Reasoning against your own numbers.
Open the cost calculatorWhat is deliberately absent
We do not compare answer quality and we do not reprint third-party benchmarks. We have no quality measurements of our own, and external tables go stale faster than prices while being compiled, almost always, by someone with a stake in the result. What is here is only what we reconcile ourselves every day: prices, limits and supported capabilities.