What Changed: Nano Banana 2.1 Is Now Generally Available
On October 6, 2026, Google released Nano Banana 2.1 (model ID gemini-nano-banana-2.1) as a generally available model in the Gemini API. It is a direct update to Nano Banana 2 (Gemini 3.1 Flash Image), built for fast, efficient image generation and conversational editing.
At the same time, Google marked the previous model, gemini-3.1-flash-image, as deprecated and named Nano Banana 2.1 as its recommended replacement. Google has not announced a shutdown date for the older model, but deprecation means it is no longer the version Google is investing in, so now is a good moment to move your workflows over.
What's New in Nano Banana 2.1
Google describes 2.1 as keeping the speed and cost efficiency of the Flash line while raising quality across the board. Here is what the official documentation highlights:
Better visual quality and realism: sharper, more lifelike results at 1K, 2K and 4K output.
Closer prompt adherence: the model follows what you ask for more faithfully.
Cleaner wide and tall images: Google says it fixed the tiling artifacts that could appear on panoramic and extra-tall formats (1:4, 4:1, 1:8 and 8:1) at 2K and 4K.
Stronger text and layouts: lettering inside images and infographic-style layouts come out more accurately.
More consistent characters: faces and characters hold up better across a series of edits.
Improved editing: Google's launch announcement calls out gains in visual design, mask-based editing and subject consistency.
Google positions Nano Banana 2.1 as the more efficient counterpart to Nano Banana Pro, which makes it a strong everyday choice when you want high quality without slowing down.
Why Switch to Nano Banana 2.1 on PoloX AI
Nano Banana 2.1 on PoloX AI keeps things simple:
1 credit per image at 1K, 2K or 4K. Higher resolution costs the same.
Text-to-image and image-to-image in one place.
Up to 10 reference images per generation (JPEG, PNG or WEBP, up to 30 MB each) for characters, products or style.
Auto aspect ratio or 14 fixed ratios from 1:1 to 21:9, including extra-tall and extra-wide 1:4, 4:1, 1:8 and 8:1 for banners and panoramas.
No watermark on your images.
Private by default, and commercial use is allowed.
Failed generations return credits, so you only spend on images you actually get.
Quick Start: Your First Nano Banana 2.1 Image
Open the generator on the PoloX AI home page.
On the Classic tab, open the model picker and select Nano Banana 2.1 under Image, choosing Text to Image or Image to Image. You can also start straight from the Nano Banana 2.1 model page, which has the same generator built in.
Write your prompt. For image-to-image, upload up to 10 reference images (JPEG, PNG or WEBP).
Choose the aspect ratio (Auto by default) and resolution (1K, 2K or 4K; 1K by default).
Click Generate. If you were using Nano Banana 2, try the same prompt on 2.1 and compare. Prefer to describe what you want in plain words? Switch to the Agent tab and let the agent write the prompt and pick the settings for you.
You can see every mode and parameter on the Nano Banana 2.1 model page.
FAQ
Will the old Nano Banana 2 model disappear?
Yes, on PoloX AI. Google has deprecated gemini-3.1-flash-image, the model behind Nano Banana 2, and has not yet announced its own shutdown date. On PoloX AI, Nano Banana 2 retires on October 29, 2026. After that date, Nano Banana 2 links open Nano Banana 2.1, so switching now gives you time to re-run your favorite prompts before the change.
Do I need to rewrite my prompts?
Nano Banana 2.1 is an update to Nano Banana 2, so your existing prompts are a good starting point. Because 2.1 follows prompts more closely, it is worth re-running your favorites to see the difference.
Does 4K cost more?
No. On PoloX AI, every Nano Banana 2.1 image costs 1 credit at 1K, 2K or 4K.
Try Nano Banana 2.1 Today
Better quality, cleaner text and steadier characters, all at 1 credit per image. Start creating with Nano Banana 2.1 on PoloX AI.