---
title: Gemini "Nano Banana" generally available
url: https://calvin.my/posts/gemini-nano-banana-generally-available
published: 2025-10-04
updated: 2026-09-14
category: AI
tags:
- gemini
- Nano Banana
summary: Gemini Nano Banana is now generally available, with API users required to switch from the preview model identifier to the production version. The image-generation model also adds support for a broader selection of aspect ratios than GPT Image 1. These formats enable outputs tailored to practical uses such as vertical mobile wallpapers and ultrawide banner images, expanding flexibility for developers and content creators.
---

# Gemini "Nano Banana" generally available

## Model Name

The Gemini Nano Banana model is now generally available for everyone. For API access, the model name should be updated.

```markup
# Old
/models/gemini-2.5-flash-image-preview

# New
/models/gemini-2.5-flash-image
```

* * *

## Aspect Ratio

The model now also supports a wider range of [aspect ratios](https://ai.google.dev/gemini-api/docs/image-generation#aspect_ratios). This enables more use cases compared to OpenAI's GPT Image 1, which has only 3 types of aspect ratios.

```json
{
  "generationConfig": {
    "imageConfig": {
      "aspectRatio": "1:1"
    }
  }
}
```

### 9:16 Example

We can use this aspect ratio for mobile phone wallpapers.

![](https://camy-pub.s3.ap-southeast-1.amazonaws.com/e4582cb0-01a3-496e-825a-c999093310fd.png)

### 21:9 Example

This type is suitable for making banners.

![](https://camy-pub.s3.ap-southeast-1.amazonaws.com/9d6de28c-3541-45f2-9308-f008c490be90.png)