# Nano Banana model guide

A model guide for Nano Banana on GPT Image Hub, covering Gemini 2.5 Flash Image use cases, 1K generation, reference-image limits, and prompt patterns for fast iteration.

URL: https://www.gptimagehub.com/models/nanobanana
Official model ID: gemini-2.5-flash-image
Provider: Google Gemini
Updated: 2026-04-30

## Direct answer

Nano Banana is the fast Gemini image option on GPT Image Hub. Use it when you want quick creative iteration, light image edits, and reference-image guided outputs at 1K. It is a good exploration model before moving a winning prompt into GPT Image 2, Nano Banana 2, or Nano Banana Pro for larger exports.

## Model facts

- Official model ID: gemini-2.5-flash-image
- Provider: Google Gemini
- Hub quality tier: 1K
- Reference images: Up to 3
- Cost per image: 25 credits (≈ $0.025 at the Plus pack rate); pricing: https://www.gptimagehub.com/pricing

## Best use cases

- Moodboard passes, visual ideation, small social concepts, and early product shot exploration.
- Fast edits where the goal is direction, not final delivery polish.
- Generating alternate compositions from one prompt family.
- Testing prompt structures before producing a final output in a higher-resolution model.

## Where to be careful

- 4K final deliverables, because this Hub configuration exposes Nano Banana at 1K only.
- Large reference boards that need more than 3 input images.
- Complex production assets where typography, fine detail, or print-scale output is critical.

## Prompting guidance

- Keep prompts compact and action-oriented: subject, change, style, and constraint.
- When editing from references, tell the model which elements must stay unchanged.
- Use it for A/B testing several prompt angles before committing to a final model.
- Avoid overloading one prompt with unrelated style systems.

## Example prompts

```text
Create three quick concepts for a playful banana-themed AI mascot, studio lighting, simple yellow and black palette, square social avatar, clean vector-like finish.
```

```text
Edit the reference image into a warm e-commerce product photo, keep the product shape unchanged, add soft shadow, pale yellow background, no text.
```

```text
Generate a 1K moodboard image for a tropical productivity app, playful fruit iconography, glass UI cards, bright desk setup, optimistic morning light.
```

## Sources

- [Google Gemini image generation docs](https://ai.google.dev/gemini-api/docs/image-generation)
- [Gemini 2.5 Flash Image model page](https://ai.google.dev/gemini-api/docs/models/gemini-2.5-flash-image)

## FAQ

### What is Nano Banana on GPT Image Hub?

Nano Banana is the Hub label for Google's gemini-2.5-flash-image model. It is positioned here as a fast 1K generation and editing option.

### How many reference images can Nano Banana use?

GPT Image Hub currently allows up to 3 reference images for Nano Banana.

### When should I upgrade a Nano Banana prompt to another model?

Move the prompt to GPT Image 2, Nano Banana 2, or Nano Banana Pro when the concept is approved and you need higher resolution, more references, or more production detail.