A side-by-side comparison of Gemini 3 Pro Image (Nano Banana Pro) and Gemini 3.1 Flash Image: input/output pricing, capabilities and available endpoints, served live from 188pay.ai. Both are reachable with the same API key.
| Item | Gemini 3 Pro Image (Nano Banana Pro) | Gemini 3.1 Flash Image |
|---|---|---|
| Input (per 1M tokens) | $1.5 | $0.375 |
| Output (per 1M tokens) | $9 | $2.25 |
On input, Gemini 3.1 Flash Image is cheaper ($1.5 vs $0.375 per 1M tokens). On output, Gemini 3.1 Flash Image is cheaper ($9 vs $2.25 per 1M tokens). All prices are per million tokens in USD.
Yes. Both are available on 188pay.ai through one API key and the same OpenAI-compatible endpoint — switching means changing the model field from "gemini-3-pro-image-preview" to "gemini-3.1-flash-image", nothing else.
Both are available on 188pay.ai under one API key — switching between them means changing the model field and nothing else, so you can use each where it fits rather than picking one.
Gemini 3 Pro Image (Nano Banana Pro) · Gemini 3.1 Flash Image · All models