Nano Banana Pro 4K API: Capabilities, Pricing, and When to Use It

Overview

**Nano Banana Pro 4K** is an AI image generation model designed for high-quality visual output, especially when teams need sharper details and larger assets for commercial or creative use. The public model ID is **NanoBananaPro-4K**.

On UniAll AI, the model supports:

**Text-to-image** generation from a prompt
**Image-to-image** generation using one reference image
**Async API calls** for production workflows
Output resolution tiers including **1K, 2K, and 4K**
Aspect ratios: **1:1, 16:9, 9:16, 4:3, 3:4**
Up to **4 images per request**

Who should use Nano Banana Pro 4K?

Nano Banana Pro 4K is best for users who need polished, high-resolution image assets rather than quick low-resolution drafts.

Good-fit users include:

Ecommerce teams creating product posters, hero images, and campaign visuals
Designers producing brand visuals or social media assets
Developers building AI image generation features into apps
Agencies creating visual concepts at scale
Automation teams that need API-based image workflows

If your priority is cost-efficient draft generation, the 1K or 2K variants may be enough. If your output needs more visual detail or larger display quality, the 4K tier is the better option.

API usage

UniAll AI exposes Nano Banana Pro 4K through an async image generation endpoint.

**Endpoint**

```http POST /v1/images/generations ```

**Required parameter**

`prompt`: the image instruction

**Optional parameters**

`generation_mode`: `text_to_image` or `image_to_image`
`image_url`: reference image URL for image-to-image mode
`aspect_ratio`: `1:1`, `16:9`, `9:16`, `4:3`, or `3:4`
`resolution`: `1K`, `2K`, or `4K`
`num_images`: 1 to 4

**Example request**

```json { "model": "NanoBananaPro-4K", "generation_mode": "image_to_image", "prompt": "A premium product poster with clean lighting and sharp details.", "image_url": "https://example.com/reference.png", "aspect_ratio": "1:1", "resolution": "4K", "num_images": 1 } ```

For text-to-image generation, omit `image_url` and set `generation_mode` to `text_to_image`.

Pricing angle

Nano Banana Pro 4K is billed per generated image. On the listed UniAll AI user pricing profile:

| Resolution | Price | |---|---:| | 1K | $0.102 / image | | 2K | $0.102 / image | | 4K | $0.204 / image |

The 4K tier costs more because it targets higher-resolution output. For production systems, teams often use 1K or 2K for drafts and reserve 4K for final selected images.

UniAll AI also supports refund-on-failure behavior for this model, which helps reduce wasted cost when a generation task fails.

Comparison: when to choose 4K vs lower resolutions

Choose **Nano Banana Pro 4K** when:

Final assets need high visual detail
Images are used in ecommerce, ads, landing pages, or posters
You need fewer post-processing or upscaling steps
The image will be viewed on large screens or used in high-quality layouts

Choose **1K or 2K variants** when:

You are testing prompts
You are generating many draft concepts
Speed and lower cost matter more than final resolution
Images are only used for thumbnails, previews, or internal review

Practical use cases

Nano Banana Pro 4K is especially useful for:

Ecommerce main images and product posters
Product photography-style generation
Brand campaign visuals
Social media creative assets
Reference-image-based redesigns
High-resolution concept art
Automated image pipelines for apps and marketplaces

Integration notes

For stable production use, send clear prompts, specify the intended aspect ratio, and choose the resolution based on the stage of your workflow. If you are generating batches, use `num_images` carefully because billing is per image. For image-to-image workflows, provide a valid PNG, JPEG, or WebP reference image URL.

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