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

Nano Banana Pro is Google’s most advanced image-generation and editing model, built on Gemini 3 Pro. It extends the original Nano Banana with significantly improved multimodal reasoning, real-world grounding, and...

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

Input, $/1M $2.00

Output, $/1M $120.00

Cache read $0.20

Cache write —

Limits

Free: 50 requests a day
Free: 1 000 requests a day (if credits>=10)
Free: 20 requests a minute

Last checked 04.11.2026 12:08:11 UTC Source

Context 65 536

Max output 32 768

Accepts images, text

Last checked 04.11.2026 12:00:14 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://openrouter.ai/api/v1`
Endpoint	`https://openrouter.ai/api/v1/images/generations`
Model id	`google/gemini-3-pro-image-preview`

curl

curl https://openrouter.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://openrouter.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://openrouter.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%3Aopenrouter%7Cgoogle/gemini-3-pro-image-preview, prices checked 2026-11-04; seller's page: https://openrouter.ai/google/gemini-3-pro-image-preview

Technical details

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