Gemini 3 Pro Image (Nano Banana Pro) vs Gemini 3.1 Flash Image (Nano Banana 2)

A side-by-side comparison of Gemini 3 Pro Image (Nano Banana Pro) and Gemini 3.1 Flash Image (Nano Banana 2): input/output pricing, capabilities and available endpoints, served live from OpenCrow. Both are reachable with the same API key.

Pricing comparison

ItemGemini 3 Pro Image (Nano Banana Pro)Gemini 3.1 Flash Image (Nano Banana 2)
Input (per 1M tokens)$1.5$0.375
Output (per 1M tokens)$9$2.25

Which should you pick

Which is cheaper, Gemini 3 Pro Image (Nano Banana Pro) or Gemini 3.1 Flash Image (Nano Banana 2)?

On input, Gemini 3.1 Flash Image (Nano Banana 2) is cheaper ($1.5 vs $0.375 per 1M tokens). On output, Gemini 3.1 Flash Image (Nano Banana 2) is cheaper ($9 vs $2.25 per 1M tokens). All prices are per million tokens in USD.

Can I switch between Gemini 3 Pro Image (Nano Banana Pro) and Gemini 3.1 Flash Image (Nano Banana 2) without changing my code?

Yes. Both are available on OpenCrow 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-preview", nothing else.

Both are available on OpenCrow 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 (Nano Banana 2) · All models