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Nano Banana Pro API

Quality-focused image generation and editing with reference-image support.

  • Text to image
  • Image editing
Try modelGet API KeyDocumentation

Starting at

$0.029

per generation

81% cheaper than fal.ai
4 parameters · 3 price options

Nano Banana Pro playground

Input

User's prompt

Reference image URLs for image generation or editing

Sign in to run

Runs are charged to your balance.

Output

Output will appear here.

Check the price and run the model. Your result will appear here; browser use does not need an API key.

Nano Banana Pro API pricing

OptionPrice per generationfal.aiYour savings
1k$0.029$0.15−81%
2k$0.029$0.15−81%
4k$0.043$0.3−86%

Quick start

Full API reference →
1curl -X POST https://api.api-stock.com/api/v1/generation/create \
2  -H "Authorization: Bearer $API_STOCK_KEY" \
3  -H "Content-Type: application/json" \
4  -d '{
5    "model": "nano-banana-pro",
6    "input": {
7      "prompt": "A cinematic shot of a city at dusk",
8      "size": "16:9",
9      "resolution": "1K"
10    }
11  }'

Parameters

NameTypeRequiredDefaultDescription
promptstringYes—User's prompt
urlsstring[]No—Reference image URLs for image generation or editing
sizestringNo16:9Output image size ratioOne of: 1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9, 1:4, 1:8, 4:1, 8:1
resolutionstringNo1KOutput image resolutionOne of: 512px, 1K, 2K, 4K

Frequently asked questions

How much does Nano Banana Pro cost?

Nano Banana Pro starts at $0.029 per generation on API Stock. The final charge depends on the selected settings.

When was Nano Banana Pro released?

Nano Banana Pro was released on November 20, 2025 and is available through API Stock.

How do I get an API key for Nano Banana Pro?

Create an account and API key on API Stock, then fund your balance. The same key works with Nano Banana Pro and other catalog models.

How do I call the Nano Banana Pro API?

POST to https://api.api-stock.com/api/v1/generation/create with your API key and model "nano-banana-pro". Use the returned task id for polling or receive a webhook.

What input parameters does Nano Banana Pro accept?

Nano Banana Pro accepts 4 input parameters, including the required field(s) prompt. See their types, defaults and allowed values above.

What happens if a Nano Banana Pro request fails?

API Stock automatically retries the request on a reserve provider. If every provider fails, the charge is refunded to your balance.

Can I use Nano Banana Pro with the same API key as other models?

Yes. Use your API Stock API key and balance for Nano Banana Pro and other catalog models.

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