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# Nano Banana 2.1 vs GPT Image 2.5 — Specs Compared | Clip Studio

> Nano Banana 2.1 vs GPT Image 2.5 (ChatGPT Image 2.5): text-to-image and edits on both, 10 aspect ratios at 1K vs 4 ad sizes. Compare specs side by side and try both online.

Canonical page: https://clipstudio.ai/ai-image-models/nano-banana-2-1-vs-gpt-image-2-5

## Intent

Both generate and edit stills from one source image. Nano Banana 2.1 accepts ten aspect ratios at 1K; ChatGPT Image 2.5 (GPT Image 2.5 on fal) accepts the four ad sizes: 16:9, 1:1, 4:5, and 9:16.

## Spec table

| Spec | Nano Banana 2.1 | ChatGPT Image 2.5 |
| --- | --- | --- |
| Provider | Google | OpenAI |
| Modes | Text to image · Image to image | Text to image · Image to image |
| Edit from a still | Yes, one source still | Yes, one source still |
| Aspect ratios | 10: 16:9, 1:1, 9:16, 4:5, 4:3, 3:2, 21:9, 5:4, 3:4, 2:3 | 4: 9:16, 1:1, 4:5, 16:9 |
| Size in Image Lab | 1K | 1024 × 1024 at 1:1 |
| Output | Raster still | Raster still |
| Prompt length | Up to 8 KB | Up to 8 KB |
| Large source stills | No extra scaling | No extra scaling |
| Best for | The newest Nano Banana stills and image-to-image edits. | Product shots and image-to-image edits. |

## Which to pick

- Pick Nano Banana 2.1 when the frame is not one of the four ad sizes: it also takes 21:9, 3:2, 2:3, 4:3, 3:4, and 5:4.
- Pick ChatGPT Image 2.5 for product shots and edits at 16:9, 1:1, 4:5, or 9:16, the sizes Ad Lab uses too.

Nano Banana 2.1 and ChatGPT Image 2.5 both run text-to-image and image-to-image from one source still in Image Lab. Nano Banana 2.1 is Google’s newest Nano Banana model, quoted at 1K across ten aspect ratios. ChatGPT Image 2.5 is OpenAI’s default image model and is limited to the four ad sizes. Choose by frame and look: Nano Banana 2.1 for wider aspect choice, ChatGPT Image 2.5 for ad-size product shots and edits. Clip Studio does not publish a quality ranking between them.

## FAQs

### Which supports more aspect ratios, Nano Banana 2.1 or GPT Image 2.5?

Nano Banana 2.1 lists ten in Image Lab (21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16). ChatGPT Image 2.5 lists four: 16:9, 1:1, 4:5, and 9:16.

### Can both edit an existing image?

Yes. Attach one source still in Image Lab to run image-to-image on either model. Prompt-only jobs stay text-to-image.

### Is GPT Image 2.5 the same as ChatGPT Image 2.5?

Yes. Image Lab labels OpenAI’s GPT Image 2.5 model ChatGPT Image 2.5. It is served through fal.ai, so you do not need an OpenAI or fal account.

### Which one uses less of my plan?

There is no single answer: ChatGPT Image 2.5 is priced by output size and Nano Banana 2.1 is priced at 1K, so the gap changes with the aspect ratio and with a source still. Both are included in every Clip Studio plan and use the same monthly generation allowance, and each setup is quoted in Image Lab before you generate. Plan details live on the pricing page.

### Are Nano Banana 2.1 and ChatGPT Image 2.5 free?

No. Both run in Image Lab, which is included in every Clip Studio plan, and every plan opens every Image Lab model. Eligible new accounts get one free Topic Short, which is a separate studio.


## Related

- [Nano Banana 2.1](https://clipstudio.ai/ai-image-models/nano-banana-2-1.md)
- [ChatGPT Image 2.5](https://clipstudio.ai/ai-image-models/gpt-image-2-5.md)
- [Image Lab](https://clipstudio.ai/image-lab.md)
- [All image models](https://clipstudio.ai/ai-image-models.md)
- [Nano Banana 2.1 vs Nano Banana Pro](https://clipstudio.ai/ai-image-models/nano-banana-2-1-vs-nano-banana-pro.md)
- [FLUX 3 Image vs Nano Banana 2.1](https://clipstudio.ai/ai-image-models/flux-3-image-vs-nano-banana-2-1.md)
- [ChatGPT Image 2.5 vs ChatGPT Image 2.5 Sunburst](https://clipstudio.ai/ai-image-models/gpt-image-2-5-vs-gpt-image-2-5-sunburst.md)
- [ChatGPT Image 2.5 vs Seedream 5 Pro](https://clipstudio.ai/ai-image-models/gpt-image-2-5-vs-seedream-5-pro.md)