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OpenKey

Nano Banana Pro (Gemini 3 Pro Image Preview)

GoogleReleased Nov 20, 2025

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...

Try in playground
Context window
66K tokens
Max output
33K tokens
Input
image, text
Output
image, text
Tokenizer
Gemini
Released
Nov 20, 2025
Reasoning
always on

Pricing

Per 1M tokens. The provider price and our flat 3% fee are separate columns — what you pay is their sum.

Per 1M tokensProvider+ 3% feeYou pay
Input$2.00$0.060$2.06
Output$12.00$0.360$12.36
Cache read$0.200$0.0060$0.206
Cache write$0.375$0.011$0.386

Benchmarks

Design Arena

CategoryEloWin rateRank
graphicdesignmodels128766.1%#3
imagemodels127262.2%#3
logomodels126061%#3
imageeditingmodels127366.2%#2

Head-to-head preference voting. How we filter and rank

Supported parameters

  • include_reasoning
  • max_tokens
  • reasoning
  • response_format
  • seed
  • stop
  • structured_outputs
  • temperature
  • top_p

Call it

OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model google/gemini-3-pro-image-preview.

Code sample language
curl https://api.openkey.ai/v1/chat/completions \
  -H "Authorization: Bearer $OPENKEY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/gemini-3-pro-image-preview",
    "messages": [{"role": "user", "content": "Hello"}]
  }'
import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.openkey.ai/v1",
    api_key=os.environ["OPENKEY_API_KEY"],
)

completion = client.chat.completions.create(
    model="google/gemini-3-pro-image-preview",
    messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.openkey.ai/v1",
  apiKey: process.env.OPENKEY_API_KEY,
});

const completion = await client.chat.completions.create({
  model: "google/gemini-3-pro-image-preview",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Questions

How much does Nano Banana Pro (Gemini 3 Pro Image Preview) cost via API?
Through OpenKey, Nano Banana Pro (Gemini 3 Pro Image Preview) costs $2.06 per 1M input tokens and $12.36 per 1M output tokens. That is the provider price ($2.00 / $12.00) plus a flat 3% fee — nothing else.
What is Nano Banana Pro (Gemini 3 Pro Image Preview)'s context window?
Nano Banana Pro (Gemini 3 Pro Image Preview) accepts up to 66K tokens of context and returns up to 33K tokens per request.
Is Nano Banana Pro (Gemini 3 Pro Image Preview) OpenAI-compatible?
Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "google/gemini-3-pro-image-preview" using any OpenAI SDK — only the base URL and API key change.
What inputs does Nano Banana Pro (Gemini 3 Pro Image Preview) support?
Nano Banana Pro (Gemini 3 Pro Image Preview) accepts image, text input and produces image, text output.

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