Google: Gemini 3 Pro Image Preview (Nano Banana Pro) · fastrouter

Gemini 3 Pro Image Preview is a high-end image generation and editing model in the Gemini 3 family (also known as Nano Banana Pro), built to produce studio-quality visuals with strong reasoning over complex prompts. It is optimized for detailed, multi-step creative workflows where you need both visual fidelity and precise control over content, layout, and text inside images.

Base model All models on this base All models of the provider to the provider

Input, $/1M $2.00

Output, $/1M $12.00

Context 65 536

Max output 32 768

Accepts images, text

Last checked 04.11.2026 12:26:37 UTC

Source provider's page

Price alerts

API

OpenAI-compatible API: the official OpenAI SDKs work with this base URL. Replace YOUR_API_KEY with your key from the provider.

API base URL	`https://go.fastrouter.ai/api/v1`
Endpoint	`https://go.fastrouter.ai/api/v1/images/generations`
Model id	`google/gemini-3-pro-image-preview`

curl

curl https://go.fastrouter.ai/api/v1/images/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "google/gemini-3-pro-image-preview", "prompt": "a lighthouse at sunset", "n": 1, "size": "1024x1024"}'

Python

import requests

r = requests.post(
    "https://go.fastrouter.ai/api/v1/images/generations",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={
      "model": "google/gemini-3-pro-image-preview",
      "prompt": "a lighthouse at sunset",
      "n": 1,
      "size": "1024x1024"
    },
)
print(r.json())

JavaScript

const r = await fetch("https://go.fastrouter.ai/api/v1/images/generations", {
  method: "POST",
  headers: {Authorization: "Bearer YOUR_API_KEY", "Content-Type": "application/json"},
  body: JSON.stringify({
    "model": "google/gemini-3-pro-image-preview",
    "prompt": "a lighthouse at sunset",
    "n": 1,
    "size": "1024x1024"
  }),
});
console.log(await r.json());

Request (JSON)

{
  "model": "google/gemini-3-pro-image-preview",
  "prompt": "a lighthouse at sunset",
  "n": 1,
  "size": "1024x1024"
}

Response (JSON)

{
  "created": 1760000000,
  "data": [
    {
      "url": "https://...",
      "b64_json": null
    }
  ]
}

The address is taken from the provider's model list; check it against the provider's documentation.

Provider's API documentation

Source: AI Rate Card, https://airatecard.com/en/c/offer%3Afastrouter%7Cgoogle/gemini-3-pro-image-preview, prices checked 2026-11-04; seller's page: https://fastrouter.ai/models/google/gemini-3-pro-image-preview

Technical details

ID: offer:fastrouter|google/gemini-3-pro-image-preview