Nano Banana 2.1
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.
Open Nano Banana 2.1 in Image LabHead-to-head · Image Lab
Nano Banana 2.1 vs ChatGPT Image 2.5
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.
Runs online, no installIncluded in plans from $19/moSpecs checked 25 October 2026 from the live Image Lab catalog
Catalog specs
Side by side in Image Lab.
Modes, edits, aspect ratios, size, and output come from the live Image Lab catalog, not from a ranked shoot-out.
Spec
Nano Banana 2.1
ChatGPT Image 2.5
Provider
Nano Banana 2.1
ChatGPT Image 2.5
OpenAI
Modes
Nano Banana 2.1
Text to image · Image to image
ChatGPT Image 2.5
Text to image · Image to image
Edit from a still
Nano Banana 2.1
Yes, one source still
ChatGPT Image 2.5
Yes, one source still
Aspect ratios
Nano Banana 2.1
10: 16:9, 1:1, 9:16, 4:5, 4:3, 3:2, 21:9, 5:4, 3:4, 2:3
ChatGPT Image 2.5
4: 9:16, 1:1, 4:5, 16:9
Size in Image Lab
Nano Banana 2.1
1K
ChatGPT Image 2.5
1024 × 1024 at 1:1
Output
Nano Banana 2.1
Raster still
ChatGPT Image 2.5
Raster still
Prompt length
Nano Banana 2.1
Up to 8 KB
ChatGPT Image 2.5
Up to 8 KB
Large source stills
Nano Banana 2.1
No extra scaling
ChatGPT Image 2.5
No extra scaling
Best for
Nano Banana 2.1
The newest Nano Banana stills and image-to-image edits.
ChatGPT Image 2.5
Product shots and image-to-image edits.
Which to pick
Which one should you use?
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.
ChatGPT Image 2.5
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.
Open ChatGPT Image 2.5 in Image LabQuestions, answered
Nano Banana 2.1 vs ChatGPT Image 2.5 FAQ
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.
More compares
Related head-to-heads.
Nano Banana 2.1 vs Nano Banana Pro
Two Google stills models with the same ten aspect ratios, the same 1K output, and edits from one source still. Pro is the higher-fidelity path and uses more of your allowance per still.
Open compareFLUX 3 Image vs Nano Banana 2.1
Black Forest Labs and Google stills models with the same ten aspect ratios at 1K and edits from one source still. FLUX 3 Image is listed for photoreal stills and precise local edits.
Open compareChatGPT Image 2.5 vs ChatGPT Image 2.5 Sunburst
Same OpenAI model family, same four ad sizes, same edit support, and the same quote at the same size. Sunburst is the precision variant for intricate detail and tightly scoped edits, with longer generation times.
Open compareChatGPT Image 2.5 vs Seedream 5 Pro
Both generate and edit stills from one source image. ChatGPT Image 2.5 takes the four ad sizes; Seedream 5 Pro takes all ten Image Lab aspect ratios at about 2.2–2.4 megapixels.
Open compare