Nano Banana 2 API pricing: cost per image at 1K, 2K and 4K

Nano Banana 2 is Google's Flash-class image model (Gemini 3.1 Flash Image), released in February 2026. On UnificAlly it runs as google/nano-banana-2: you pick 1K, 2K, or 4K at request time and pay the matching rate per image. This guide covers what it costs, what it supports, and how it compares with the rest of the Nano Banana family. Live rates: pricing page.

TL;DR: Nano Banana 2 costs $0.034 at 1K, $0.051 at 2K, and $0.076 at 4K per image on UnificAlly. It supports 15 aspect ratios from 1:8 to 8:1, plus seed for reproducible output. On October 6, 2026 Google deprecated it in favor of Nano Banana 2.1, which costs $0.02 to $0.045 per image and ranks higher on Arena. For new work, start on 2.1. See Nano Banana 2.1 vs Nano Banana 2 for the full comparison.

What is Nano Banana 2?

Nano Banana 2 is Google's Gemini 3.1 Flash Image model (gemini-3.1-flash-image). It generates and edits images from a text prompt plus optional reference images, and you set the output size with one resolution parameter:

• 1K. Fast drafts, social tiles, large-volume use.
• 2K. Sharper detail, presentation graphics, web hero art.
• 4K. Maximum detail, print-ready output, large displays.

Google's top-end sibling is Nano Banana Pro (Gemini 3 Pro Image), and its newer Flash-class successor is Nano Banana 2.1. Both are compared below.

Is Nano Banana 2 deprecated?

Yes. Google's changelog of October 6, 2026 marks gemini-3.1-flash-image as deprecated and recommends migrating to gemini-nano-banana-2.1. As of October 7, 2026, Google's deprecations page lists no shutdown date. UnificAlly still serves google/nano-banana-2, and existing integrations keep working. We will update this post if Google sets a date.

What you can do with Nano Banana 2

Inputs

• prompt. Required text describing the image.
• resolution. 1K, 2K, or 4K (default 1K). Drives both output size and per-image price.
• aspect_ratio. 1:1, 1:4, 1:8, 2:3, 3:2, 3:4, 4:1, 4:3, 4:5, 5:4, 8:1, 9:16, 16:9, 21:9, or match_input_image. Default 1:1.
• image_urls. Optional reference images for editing and multi-reference generation.
• seed. Optional integer for reproducible output.
• nsfw_check. Moderates uploaded inputs. Default on.

Output

• A single image at the chosen resolution and aspect ratio.
• SynthID invisible watermark embedded for AI provenance.
• Returned through the async task API.

Nano Banana 2 pricing

Our current rates per generated image, refreshed from the live price list on every deploy:

Pay per image, no subscription, and failed generations are never charged. New accounts start with $0.50 of balance to test with.

Nano Banana 2.1 is cheaper than Nano Banana 2 at every size, so the main reasons to stay on Nano Banana 2 are its wider aspect ratio list and seed support.

Nano Banana 2 vs Nano Banana 2.1 vs Nano Banana Pro

Arena values are read from arena.ai; the Nano Banana 2 entries are its web-search variant, and the 2.1 scores are preliminary.

How to call Nano Banana 2

The API is async: POST a task, then poll it or pass a callback_url.

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "google/nano-banana-2",
    "input": {
      "prompt": "A campaign banner for a coffee brand: espresso cups lined up on warm linen, morning light",
      "aspect_ratio": "8:1",
      "resolution": "4K",
      "seed": 42
    }
  }'

The response returns a task_id. Poll GET /v1/tasks/<task_id> until status is completed, then read the image URL from data.output. Add "dry_run": true to the request body to get the price without running the job. Full parameters: Nano Banana 2 docs.

To switch to Nano Banana 2.1, change the model to google/nano-banana-2.1, keep the aspect ratio to 1:1, 16:9, 9:16, 4:3, 3:4, or auto, and drop seed.

Things to know about Nano Banana 2

• Defaulting to 4K on every call. 4K costs more than double 1K and is not always visibly different at small display sizes. Draft at 1K, re-render the keepers at 4K.
• Panoramas. Nano Banana 2 takes 1:4, 4:1, 1:8, 8:1, and 21:9; Nano Banana 2.1 on UnificAlly does not. Keep banner and strip jobs here.
• Long in-image text. Short headlines and labels render well. Multi-paragraph copy is better added in post.
• Too many references. Reference images compete for influence. Send the few that anchor the look.
• Stripping SynthID. The invisible watermark is part of Google's AI provenance signal. Pipelines that strip metadata also strip it, so keep it where compliance matters.

Nano Banana 2 FAQ

What is Nano Banana 2?

Nano Banana 2 is Google's Gemini 3.1 Flash Image model, released in February 2026. It generates and edits images from a prompt and optional reference images at 1K, 2K, or 4K. On UnificAlly its model ID is google/nano-banana-2.

How much does Nano Banana 2 cost?

On UnificAlly, Nano Banana 2 costs $0.034 per image at 1K, $0.051 at 2K, and $0.076 at 4K, billed per generated image with no subscription. Failed generations are not charged. Check the pricing page for current rates.

Is Nano Banana 2 deprecated?

Yes. Google deprecated gemini-3.1-flash-image on October 6, 2026 and recommends Nano Banana 2.1 as the replacement. As of October 7, 2026, no shutdown date has been announced, and UnificAlly still serves Nano Banana 2.

What is the difference between Nano Banana 2 and Nano Banana Pro?

Nano Banana 2 is the Flash-class model (Gemini 3.1 Flash Image); Nano Banana Pro is Gemini 3 Pro Image. On Arena (October 6, 2026), Nano Banana 2 scores 1261 in text-to-image and 1387 in edit, against 1248 and 1390 for Nano Banana Pro 2K, so they are close. Pro costs more per image on UnificAlly.

Should I use Nano Banana 2 or Nano Banana 2.1?

Use Nano Banana 2.1 for new work: it costs $0.02 to $0.045 per image on UnificAlly and ranks #5 on Arena text-to-image against #11 for Nano Banana 2. Stay on Nano Banana 2 only for panorama ratios (1:4, 4:1, 1:8, 8:1, 21:9) or when you need seed for reproducible output.

Related reading on Nano Banana 2

• Nano Banana 2.1 vs Nano Banana 2: pricing, Arena scores, and how to migrate.
• Nano Banana 2 model page: live playground with the 1K/2K/4K toggle.
• Nano Banana 2.1 model page: the successor.
• GPT Image 2 vs Nano Banana: the head-to-head with OpenAI.