What is the best AI photo generator model here?+
There is no single best one, which is why all three are in the form. Z-Image at 1 credit is right for backgrounds and volume. Nano Banana 2 at 2 credits handles real products and recurring faces with up to 14 reference images. GPT Image 2.5 at 2 credits is the one to use when text must be readable inside the image.
How much does one AI image cost?+
Z-Image is 1 credit at 1K, which is its only size. Nano Banana 2 is 2 credits at 1K, 3 at 2K and 4 at 4K. GPT Image 2.5 is 2 credits at 1K and 2K, and 4 at 4K. On the $49.99 plan for 500 credits, a credit is about 10 cents.
What is Nano Banana 2?+
Nano Banana 2 is Google's image model, offered here as one of three model choices. On this surface it accepts up to 14 reference images and prompts up to 4,000 characters, and it usually returns in 10 to 30 seconds. It is the default pick for product shots and for keeping one person consistent.
What is Z-Image and why is it 1 credit?+
Z-Image is the cheapest model in the form. It renders at 1K only, takes a text prompt with no reference images, caps the prompt at 900 characters and usually returns in 5 to 15 seconds. Fewer inputs and one resolution is exactly why it costs a single credit per image.
Can I upload my own product photo as a reference?+
Yes, on two of the three models. Nano Banana 2 takes up to 14 reference images, which is the right choice for a product that has to stay recognizable. GPT Image 2.5 takes one. Z-Image takes none and works from the text prompt alone.
Which model handles text inside the image?+
GPT Image 2.5. It is the strongest of the three at rendering legible, correctly spelled words inside the frame, which matters for labels, packaging, posters and thumbnails. It also costs the same at 2K as at 1K, so take the larger size when you pick it.
How many images can I generate at once?+
One to four per run. You pay per image, so a four-image run costs four times a single image on that model and resolution. Aspect chips start at 9:16 because most of this content ends up vertical, and other ratios are in the same row.
Can I edit an image after it is generated?+
No. There is no editor, no layers, no masking and no inpainting on this surface. You adjust the prompt or the reference images and run it again. Retouching happens in whatever image editor you already use, after you download the file.