Test 50 ad image concepts for the price of 4
Why the draft stage of an image ad belongs on a fast, low-cost model, what KoiX Image costs next to Nano Banana, Seedream and GPT Image, and five renders made with it.
Short answer: KoiX Image makes an ad image in about six seconds for about a fourteenth of the price of Nano Banana Pro. That is the model for the draft stage, where you need fifty concepts to find the one worth finishing. For the budget of four Nano Banana Pro images you get about fifty KoiX Image drafts.
What does KoiX Image cost next to other image models?
| Price per image (KoiX Image = 1×) | Typical render time | |
|---|---|---|
| KoiX Image | 1× | about 6 s |
| Seedream 5.0 Pro | 7× | about 45 s |
| GPT Image 2 | 7× | about 30 s |
| Nano Banana 2 | 8× | about 18 s |
| Nano Banana Pro | 14× | about 30 s |
Prices compare one 1K image at each model's default settings in MarketingX, October 2026. GPT Image 2 changes price with its quality setting. Render time is the median time from pressing Generate to a finished image.
Why put the draft stage on a cheap model?
Most of the images made for an ad are never shipped. They are the angles, backgrounds and lighting you try before one of them is obviously right. Paying premium prices for that exploration means trying fewer ideas. Moving it to a model that costs a fraction and answers in seconds means trying more of them, and the winner is usually somewhere in the extra ones.
What does KoiX Image actually make?
Five ad briefs, one take each, nothing picked or retouched.
A short headline comes out clean, as the Glow Daily poster shows. Small print does not: the fine text on the perfume label is not real words. For a real product, put your own product photo in at the finishing stage.
How do you go from draft to final?
- Write the brief once and run it on KoiX Image with four images per run. Change one thing at a time: the angle, the background, the light.
- Pick the two or three concepts that work.
- Run those on a premium model such as Nano Banana Pro or Seedream 5.0 Pro, with your product photo as a reference, for the finished image.
- Check the final for small print and for any brand mark you did not ask for before it runs.
The guide to the premium image models covers which one fits which finish. The same idea works for video: KoiX Pro does it for clips.
Questions people ask
Is KoiX Image a good Nano Banana alternative?
For drafts and concept tests, yes: about a fourteenth of the price of Nano Banana Pro and an image in about six seconds. For a finished ad with your exact product and fine print, Nano Banana Pro is still the stronger finish.
What resolution does KoiX Image make?
1024 by 1024 for a square, with ten aspect ratios from 21:9 to 9:16.
Can KoiX Image edit an existing image?
Yes. Add one or two reference images and it edits from them.
How many images does one run make?
Up to four, each billed on its own.
Draft your next concepts in Image Generate.
