Nano Banana 2.1 at 2K ($0.15) vs Pro at 1K ($0.1875) on Sume
A 2K Nano Banana 2.1 image bills $0.15 on Sume, less than a 1K Pro image at $0.1875. Full price ladder for both rows and when each pairing makes sense.
On Sume, Nano Banana 2.1 at 2K bills $0.15 per image, which is less than Nano Banana Pro at 1K, $0.1875. So the resolution tier of the cheaper model can overtake the entry tier of the dearer one. At 4K the order holds again: $0.20 for 2.1 against $0.375 for Pro.
The full ladder
| Tier | Nano Banana 2.1 | Nano Banana Pro |
|---|---|---|
| 0.5K | $0.075 | $0.1875 (default rate) |
| 1K | $0.10 | $0.1875 |
| 2K | $0.15 | $0.1875 |
| 4K | $0.20 | $0.375 |
How the numbers come about
Both rows are list rate times 1.25. For 2.1 the list is $0.06 at 0.5K, $0.08 at 1K, $0.12 at 2K and $0.16 at 4K. For Pro it is $0.15 at the default tier and $0.30 at 4K. fal's Pro page states $0.15 for standard resolutions and double for 4K (fal, read 2026-10-07). The catalog rows also carry notes that admission scales for the 4K tier.
Three useful pairings
- Cheap drafts: 2.1 at 0.5K ($0.075) or 1K ($0.10), then a Pro final at 2K ($0.1875).
- Same output size, different model: 2.1 at 2K costs $0.15, Pro at 2K costs $0.1875. The gap is $0.0375 per image, or $3.75 over 100 images.
- Wide banners: only 2.1 lists 4:1, 1:4, 8:1 and 1:8. Pro tops out at 21:9.
A 50-image test, priced
Fifty images at 2K cost 50 x $0.15 = $7.50 on 2.1 and 50 x $0.1875 = $9.375 on Pro. Fifty at 4K cost $10.00 and $18.75. The difference between rows is a measurement problem as much as a price one, since Sume does not publish a quality comparison. Run both on your own prompts before you commit.
Google also notes that every image from these models carries a SynthID watermark (Google AI, read 2026-10-07), which is the same for both rows.
Draft, then finish
A cheap workflow is a two-step one. Draft four options at 0.5K on 2.1 with n: 4: 4 x $0.075 = $0.30. Pick one, then render the final on the row you prefer. A 2.1 final at 2K adds $0.15, and a Pro final at 2K adds $0.1875, so the whole job costs $0.45 or $0.4875. Skipping the draft and generating four finals directly at 2K costs $0.60 on 2.1 and $0.75 on Pro.
The draft is only useful if the final matches the idea. Keep the prompt and ratio identical between steps, and note that the two Nano Banana families are different models, so a Pro final will not reproduce a 2.1 draft pixel for pixel. Send the chosen draft as an input_references item if you want the final to follow it.
Where to confirm
Read pricing from GET /v1/images/models/{id}/endpoints and usage.cost from the response. Both are the billed amount, margin included, per the Image API page.
Sources
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Written by Sume