Gemini 3 Pro Preview vs GPT-5
Data reconciled August 15, 2026
Short answer
Gemini 3 Pro Preview and GPT-5 each win on different axes — neither is simply cheaper or better across the board.
GPT-5 is 1.6× cheaper on input.
GPT-5 is 1.2× cheaper on output.
Gemini 3 Pro Preview holds a 3.9× larger context window.
GPT-5 returns a 2× longer answer per call.
Side by side
| Parameter | Gemini 3 Pro Preview | GPT-5 |
|---|---|---|
| Provider | Google (Gemini) | OpenAI |
| Input, $ per 1M tokens | $2.00 | $1.25 |
| Output, $ per 1M tokens | $12.00 | $10.00 |
| Cache read, $ per 1M | $0.20 | $0.13 |
| Context window | 1,048,576 | 272,000 |
| Max output | 65,535 | 128,000 |
| Vision | yes | yes |
| Tools | yes | yes |
| Reasoning | yes | yes |
| 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 GPT-5 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.