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Image Google · 2025-08

Nano Banana API

The original Gemini 2.5 Flash Image for quick 1K edits and generations

$0.0359per image

Failed generations are not charged. Prices exclude taxes. Billed from your prepaid USD balance.

Exact cost for your settings →

Examples

What Nano Banana can do

Gemini 2.5 Flash Image (Nano Banana) example output. Prompt: "A photorealistic close-up portrait of an elderly Japanese ceramicist with deep, sun-etched wrinkles and a warm, knowing smile. He is carefully inspecting a freshly glazed tea bowl. The setting is his rustic, sun-drenched workshop. The scene is illuminated by soft, golden hour light streaming through a window, highlighting the fine texture of the clay. Captured with an 85mm portrait lens, resulting in a soft, blurred background (bokeh). The overall mood is serene and masterful. Vertical portrait orientation."
Gemini 2.5 Flash Image (Nano Banana) example output. Prompt: "A photorealistic close-up portrait of an elderly…
Gemini 2.5 Flash Image (Nano Banana) example output. Prompt: "A kawaii-style sticker of a happy red panda wearing a tiny bamboo hat. It's munching on a green bamboo leaf. The design features bold, clean outlines, simple cel-shading, and a vibrant color palette. The background must be white."
Gemini 2.5 Flash Image (Nano Banana) example output. Prompt: "A kawaii-style sticker of a happy red panda wearing a…
Gemini 2.5 Flash Image (Nano Banana) example output. Prompt: "A high-resolution, studio-lit product photograph of a minimalist ceramic coffee mug in matte black, presented on a polished concrete surface. The lighting is a three-point softbox setup designed to create soft, diffused highlights and eliminate harsh shadows. The camera angle is a slightly elevated 45-degree shot to showcase its clean lines. Ultra-realistic, with sharp focus on the steam rising from the coffee. Square image."
Gemini 2.5 Flash Image (Nano Banana) example output. Prompt: "A high-resolution, studio-lit product photograph of a…

Official examples from the model vendor: Google.

Nano Banana is Google's Gemini 2.5 Flash Image, released in August 2025 and the first model to carry the Nano Banana name. It does text-to-image and image-to-image with up to 14 reference images, in 10 aspect ratios from 1:1 to 21:9. Output is 1K only, one image per request. Google now labels it a legacy model, so it mainly makes sense for existing pipelines tuned to its look, or for simple 1K edits where a newer tier adds nothing.

Best for

  • Keeping an existing workflow stable while you test newer models
  • Quick 1K edits: background swaps, outfit changes, object removal
  • Avatars and social thumbnails that do not need high resolution
  • Combining a few reference photos into one scene

Prompting tips

  • Phrase edits as instructions: "remove the car, keep the street and the lighting".
  • Do not ask for 2K or 4K; anything above 1K returns an error on this model.
  • The default ratio on Jantaris is 1:1, so set aspect_ratio on edits to match the source photo.
  • When you need higher resolution or several images per call, move the same prompt to Nano Banana 2.

FAQ

What does Nano Banana cost per image?

Current pricing is $0.0359 per image. The cost is estimated before the request runs, and failed generations are refunded in full.

Is Nano Banana still supported?

Google lists Gemini 2.5 Flash Image as a legacy model. It still runs on Jantaris, but new projects will usually get more from Nano Banana 2 or Nano Banana Pro.

Can Nano Banana output 4K?

No. It is limited to 1K, and requests for 2K or 4K return an error.

How to call Nano Banana via API

curl https://jantaris.com/v1/generate?wait=60 \
  -H "Authorization: Bearer $JANTARIS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "nano-banana",
  "input": {
    "prompt": "Product photo of a matte black ceramic coffee cup on a travertine table, soft window light, 50mm",
    "aspect_ratio": "1:1",
    "resolution": "1k"
  }
}'

Parameters

ParameterTypeAllowedDefault
prompt *string≤ 32000 chars
aspect_ratiostring1:1 2:3 3:2 3:4 4:3 4:5 5:4 9:16 16:9 21:91:1
resolutionstring1k1k
image_urlsarraymax 14

The same schema is available from GET /v1/models/nano-banana.