Introducing Nano Banana 2.1 API on Pixazo API: 4K Text-to-Image + Conversational Editing

Google’s image model just levelled up. The Nano Banana 2.1 API is now live on Pixazo — a text-to-image and conversational image-editing model that renders up to 4K, supports an unusually wide range of aspect ratios, and blends up to 14 reference images while keeping faces and objects consistent. One request, one key, images back in seconds.

What is Nano Banana 2.1?

Nano Banana is Google’s image model — built on Gemini’s native image generation — for creating and editing pictures from a text prompt. Its party trick is conversational editing: you can change one part of an image — swap a background, recolour a jacket, add an object — while the rest of the photo stays exactly the same. Version 2.1 pushes resolution, aspect range and multi-image control further than any Nano Banana before it, and you reach all of it through a single Pixazo endpoint.

Who it’s for

Suggested Read: Introducing Nano Banana 2 API on Pixazo

Four upgrades in version 2.1

Pick your resolution

Resolution is a single parameter (resolution) and it’s the main lever on both quality and price. Start low while you iterate, then re-render the keeper at 4K.

Suggested Read: Nano Banana Pro & Nano Banana 2 API Pricing: The Cheapest Way to Access Both

One model, fifteen shapes

Set aspect_ratio to anything from a cinematic 21:9 to a slim 1:8 — no cropping or re-rendering to fit a format. A sample of the range, drawn to scale:

Suggested Read: Best Text-to-Image APIs in 2026

Conversational editing, in practice

Pass an input image and a plain-language instruction. Nano Banana 2.1 rewrites only the part you asked for and leaves the rest untouched — here, the same portrait with its plain studio backdrop swapped for a sunlit autumn park, while the face, freckles, hair and sweater stay identical:

BEFORE

AFTER

It can also take up to 14 reference images in a single call and blend them into one coherent result:

Call it in one request

The API is async: you POST a prompt, get a request_id and a polling URL back, then fetch the finished image (or let a webhook push it to you).

POST https://gateway.pixazo.ai/nano-banana-2-1/v1/text-to-imageOcp-Apim-Subscription-Key: <your-api-key> {  "prompt": "a neon-lit tokyo alley at night, cinematic",  "num_images": 1,  "aspect_ratio": "16:9",  "resolution": "2K"} # 202 Accepted{ "request_id": "nano-banana-2-1_019d…",  "polling_url": ".../v2/requests/status/<id>" }# poll until COMPLETED → output.jpg on the CDN

What it costs

Nano Banana 2.1 is billed per image and scales with resolution — it starts at roughly $0.023 per image at 1K, with 2K and 4K costing more. You only pay for successful generations, there are no monthly minimums, and new accounts get 10% cashback on first top-up on the first top-up. See the live tiers on the model page.

Suggested Read: The Top 10 Image Generation APIs in 2026

Start building in 3 steps

Suggested Read: Nano Banana 2 Lite API: Google’s Fastest Nano Banana Model

Conclusion

Nano Banana 2.1 is the most capable Nano Banana yet: 4K output, fifteen aspect ratios, true conversational editing and 14-image blending — all behind one async Pixazo endpoint. Whether you’re building a design tool, automating product shots or generating social art at scale, the Nano Banana 2.1 API gives you Google-grade image quality with a developer-friendly, pay-per-image model.

Frequently Asked Questions

Q1. What is the Nano Banana 2.1 API?

It is Pixazo’s API for Google’s Nano Banana 2.1 image model (built on Gemini) — a single async endpoint for text-to-image generation and conversational image editing, with output up to 4K.

Q2. What resolutions and aspect ratios does it support?

Resolutions of 1K, 2K and 4K, and 15 aspect ratios ranging from 21:9 and 8:1 down to 9:16 and 1:8 (plus an auto option).

Q3. Can Nano Banana 2.1 edit an existing image?

Yes. Send an input image with a text instruction and it edits only the part you describe, keeping the rest of the picture unchanged. It can also blend up to 14 reference images.

Q4. How much does the Nano Banana 2.1 API cost?

It is priced per image and scales with resolution, starting around $0.023 per image at 1K. You only pay for successful generations — see current tiers on the model page.

Q5. Is the API synchronous or asynchronous?

Asynchronous. You POST a request and receive a request ID and polling URL; fetch the finished image from the polling URL or receive it via a webhook callback.

Q6. How do I get started?

Create an API key from your Pixazo API dashboard (new accounts get 10% cashback on their first top-up), then POST your prompt to the text-to-image endpoint with your chosen aspect ratio and resolution. Full parameters are on the model page.