Gemini 3 Pro Preview vs Grok 4
Data reconciled August 15, 2026
Short answer
Gemini 3 Pro Preview is 1.5× cheaper than Grok 4 on input and 1.3× cheaper on output, while giving up nothing on context or capabilities. On measurable parameters the choice is unambiguous.
Side by side
| Parameter | Gemini 3 Pro Preview | Grok 4 |
|---|---|---|
| Provider | Google (Gemini) | xAI |
| Input, $ per 1M tokens | $2.00 | $3.00 |
| Output, $ per 1M tokens | $12.00 | $15.00 |
| Cache read, $ per 1M | $0.20 | — |
| Context window | 1,048,576 | 256,000 |
| Max output | 65,535 | 256,000 |
| Vision | yes | no |
| Tools | yes | yes |
| Reasoning | yes | 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 Gemini 3 Pro Preview and Grok 4 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.