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

What is Nano Banana 2 2K?

Nano Banana 2 2K is an AI image generation model designed for high-quality commercial visuals. On UniAll AI, the public model id is `NanoBanana2-2K`.

It supports both text-to-image and image-to-image workflows, making it useful for generating new visuals from prompts or transforming a reference image into a polished output.

Key capabilities

**Text-to-image**: create images from a written prompt.
**Image-to-image**: use one reference image plus a prompt for guided generation.
**Async API**: submit generation jobs through an asynchronous image endpoint.
**Resolution options**: 0.5K, 1K, 2K, and 4K tiers are available in the same model family.
**Aspect ratios**: supports `1:1`, `16:9`, `9:16`, `4:3`, and `3:4`.
**Batch output**: generate 1 to 4 images per request.

Who should use it?

Nano Banana 2 2K is suitable for teams that need consistent, production-ready image assets, including:

Ecommerce teams creating product posters or main product images
Marketing teams producing social media and ad creatives
Designers building brand visuals and campaign concepts
Developers adding AI image generation to SaaS products or internal tools
Agencies and platform operators integrating image workflows for customers

API usage

Use the UniAll AI image generation endpoint:

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

The request is asynchronous. Set the model to `NanoBanana2-2K` and choose a generation mode.

Text-to-image example

```json { "model": "NanoBanana2-2K", "generation_mode": "text_to_image", "prompt": "A premium skincare product poster with soft studio lighting, clean background, sharp details, luxury commercial style.", "aspect_ratio": "1:1", "resolution": "2K", "num_images": 1 } ```

Image-to-image example

```json { "model": "NanoBanana2-2K", "generation_mode": "image_to_image", "prompt": "Turn the reference product photo into a polished ecommerce hero image with clean lighting and a minimal premium background.", "image_url": "https://example.com/reference.png", "aspect_ratio": "1:1", "resolution": "2K", "num_images": 1 } ```

Supported parameters

| Parameter | Required | Description | |---|---:|---| | `model` | Yes | Use `NanoBanana2-2K`. | | `prompt` | Yes | Text instruction for the image. | | `generation_mode` | Recommended | `text_to_image` or `image_to_image`. | | `image_url` | Required for image-to-image | Reference image URL. Supports PNG, JPEG, and WebP uploads. | | `aspect_ratio` | No | `1:1`, `16:9`, `9:16`, `4:3`, or `3:4`. Default is `1:1`. | | `resolution` | No | Output tier such as `2K`. | | `num_images` | No | Number of outputs, from 1 to 4. |

Pricing angle

Nano Banana 2 2K is billed per generated image. The listed UniAll AI user price for the 2K tier is **$0.0816 per image**, shown as about **$0.082 / image**. API or partner pricing may differ by account type and resolution tier.

Current family tiers include:

0.5K: from $0.0408 / image for standard user pricing
1K: from $0.0544 / image for standard user pricing
2K: from $0.0816 / image for standard user pricing
4K: from $0.1088 / image for standard user pricing

Failed generations are eligible for refund handling when supported by the platform configuration.

Best-fit workflows

Nano Banana 2 2K works well when image quality matters but you still need API automation:

Product photo enhancement and ecommerce main images
Campaign posters and brand visuals
Social media creative generation
Reference-image guided redesign
AI image workflows inside SaaS, CMS, or marketplace tools

For developers, the main advantage is a simple image-generation interface with clear required fields, async processing, and predictable per-image billing.

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常见问题

What is the public model id for Nano Banana 2 2K?

The public model id is `NanoBanana2-2K`. Use this value in the `model` field when calling the UniAll AI image generation API.

Does Nano Banana 2 2K support both text-to-image and image-to-image?

Yes. It supports `text_to_image` with a prompt, and `image_to_image` with both a prompt and an `image_url` reference image.

How is Nano Banana 2 2K priced?

It is billed per generated image. The standard UniAll AI user price for the 2K tier is $0.0816 per image, displayed as about $0.082 / image. Pricing can vary by resolution and account type.