"4K" gets used loosely in AI image tools. Sometimes it means the model genuinely renders at 4K. Sometimes it means a 1K image got upscaled and re-labeled. Sometimes — and this is the uncomfortable one — it means nobody actually checked, and a label just kept getting copy-pasted forward from an earlier, truer version of the product.
This week we went looking for that third case on our own site. We found it in three places.
What we found
Nano Banana and Nano Banana Pro are two of the models behind Oranokai's product-edit and scene-generation tools. Both support a real, native resolution parameter on fal.ai's side — you can ask for 1K, 2K, or genuine 4K output, and the model actually renders at that size, not just a resized copy of something smaller.
Auditing every place these two models get called, we found:
- Our own pricing page described Nano Banana Pro as "4K photorealistic." It has never generated 4K. Every real call was requesting 2K.
- The scene-only generation path (typing a prompt with no uploaded photo) for plain Nano Banana was silently defaulting to 1K output — while being billed the same as the 2K product-edit path for the identical model. Different code path, same name, same billing, quietly lower resolution.
- A post-generation edit flow (re-editing an image you'd already generated) had the same gap — the resolution parameter was simply never being sent, so it fell back to the model's own default instead of what the model was supposed to deliver.
None of these were something a user would necessarily notice on any single image. They'd only show up as a nagging sense that results were softer than expected, or a mismatch between marketing copy and what actually downloaded. That's exactly the kind of gap that's easy to miss and easy to let sit — which is why we went looking for it deliberately instead of waiting for someone to report it.
What we fixed
Every path above now sends the resolution it's actually supposed to. The pricing page copy was corrected — "4K photorealistic" became "2K photorealistic," because that's what was really being delivered.
And then, since the underlying capability was sitting right there unused, we shipped it properly: real 4K generation is now a genuine, selectable option for both Nano Banana and Nano Banana Pro on the Generate page — not a marketing label, an actual toggle that requests actual 4K from the model, set up separately from 2K so the choice is clear.
Why bother writing this up
We could have just fixed the bugs quietly. We're writing about it instead because "loosely-defined 4K" is common enough across this category that it's worth being specific about which kind you're getting. Ours is now the kind where 4K means the model actually rendered 4K, because we checked, not because it was implied and nobody looked closely.
If you've been generating with Nano Banana or Nano Banana Pro and want to compare — the new 2K/4K toggle sits right next to the model picker on the Generate page.