Nano Banana 2 4K API for High-Resolution AI Image Generation

What is Nano Banana 2 4K?

Nano Banana 2 4K is a high-resolution AI image generation model available on UniAll AI. It is designed for detailed visual output, commercial image assets, product posters, brand visuals, social media creatives, and other delivery-grade materials.

The public model id is `NanoBanana2-4K`.

The model supports:

Text-to-image generation
Image-to-image generation with one reference image
Async API jobs
Multiple aspect ratios
Resolution tiers from 0.5K to 4K
Up to 4 images per request

Who should use NanoBanana2-4K?

NanoBanana2-4K is useful for teams that need sharp, production-oriented image generation rather than quick concept-only outputs.

Common users include:

Ecommerce teams generating product posters, main images, and campaign visuals
Marketing teams creating social media images and brand creatives
Designers prototyping high-resolution concepts
Developers building image generation workflows into apps or internal tools
Agencies and platform operators offering AI image generation to end users

API usage

Nano Banana 2 4K is available through UniAll AI's async image generation endpoint:

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

Required parameter:

`prompt`: text instruction for the image

Optional parameters include:

`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`: `0.5K`, `1K`, `2K`, or `4K`
`num_images`: 1 to 4

Example request:

```json { "model": "NanoBanana2-4K", "generation_mode": "image_to_image", "prompt": "A premium product poster with clean studio lighting, sharp details, and a minimal luxury background.", "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 2 4K is billed per generated image. On UniAll AI, the listed user price for the 4K tier is approximately `$0.109 / image`.

Available resolution tiers include:

| Resolution | Listed user price | |---|---:| | 0.5K | $0.041 / image | | 1K | $0.054 / image | | 2K | $0.082 / image | | 4K | $0.109 / image |

For cost-sensitive workflows, use 0.5K or 1K for drafts, then switch to 2K or 4K for final assets. Failed generations are eligible for refund handling according to UniAll AI platform rules.

Best-fit use cases

NanoBanana2-4K is a strong fit when image detail, clean composition, and output resolution matter. Practical use cases include ecommerce product images, product photography-style visuals, brand posters, advertising creatives, social media assets, character-consistent visual concepts, and reference-image-based redesigns.

For automated production, developers can combine async API calls with job status polling or callbacks in their own workflow. This makes the model suitable for batch image generation, internal creative tools, storefront automation, and reseller or sub-site integrations.

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常见问题

What can Nano Banana 2 4K generate?

Nano Banana 2 4K can generate high-resolution AI images from text prompts or transform a provided reference image. It is suitable for product visuals, posters, ecommerce images, brand creatives, and social media assets.

How do I call the Nano Banana 2 4K API?

Send an async POST request to /v1/images/generations with model set to NanoBanana2-4K. Include a prompt, choose text_to_image or image_to_image, and optionally set image_url, aspect_ratio, resolution, and num_images.

How is Nano Banana 2 4K priced?

It is billed per generated image. On UniAll AI, the listed user price for the 4K tier is about $0.109 per image, with lower-cost 0.5K, 1K, and 2K tiers available for drafts or lighter workflows.