300 Nano Banana 2.1 images across four sizes: $30.00 on Sume
A 300-image Nano Banana 2.1 batch split 150 at 0.5K, 90 at 1K, 45 at 2K and 15 at 4K costs $30.00 on Sume; per-tier math shown.
A 300-image Nano Banana 2.1 batch split 150 at 0.5K, 90 at 1K, 45 at 2K and 15 at 4K costs $30.00 on Sume: 150 x $0.075 + 90 x $0.10 + 45 x $0.15 + 15 x $0.20. The 4K images are 5 percent of the count and 10 percent of the spend.
Sizing the batch
Nano Banana 2.1 on Sume is priced per image by size: 0.5K $0.075, 1K $0.10, 2K $0.15, 4K $0.20. Multiply each tier's count by its price and add the tiers.
150 x $0.075 = $11.25. 90 x $0.10 = $9.00. 45 x $0.15 = $6.75. 15 x $0.20 = $3.00. Total $30.00, or $0.10 per image on average.
| Size | Images | Price each | Subtotal |
|---|---|---|---|
| 0.5K | 150 | $0.075 | 150 x $0.075 = $11.25 |
| 1K | 90 | $0.10 | 90 x $0.10 = $9.00 |
| 2K | 45 | $0.15 | 45 x $0.15 = $6.75 |
| 4K | 15 | $0.20 | 15 x $0.20 = $3.00 |
Where the spend sits
The 0.5K images are half the count and 37.5 percent of the spend. The 4K images are 5 percent of the count and 10 percent of the spend. If you cut 4K to 5 images and move the other 10 to 2K, the total falls by 10 x ($0.20 - $0.15) = $0.50.
That is small. The larger lever is the number of images generated: dropping the 0.5K group from 150 to 100 saves $3.75.
Against Nano Banana Pro
Nano Banana Pro is $0.1875 per image at 1K or 2K and $0.375 at 4K on Sume. For the same 300-image mix, with 0.5K images rounded up to 1K at $0.1875, you would pay roughly 150 x $0.1875 + 90 x $0.1875 + 45 x $0.1875 + 15 x $0.375 = $28.125 + $16.875 + $8.4375 + $5.625 = $59.06 against $30.00.
That is a rough comparison, since Pro has no 0.5K row in the shared price list; it shows the order of magnitude, not an exact quote.
A second scenario
Double the batch. Six hundred images in the same proportions are 300 at 0.5K, 180 at 1K, 90 at 2K and 30 at 4K: $22.50 + $18.00 + $13.50 + $6.00 = $60.00. The price is linear in count, so a 600-image batch costs exactly twice the 300-image one. Only a change in the size mix changes the average per image.
Checks
Prices come from the public catalog at api.sume.com/v1/catalog. The Images docs page lists the model ids and size options. Generate one image per tier ($0.525 for the four) before running the full mix.
Reproduce the numbers
Open https://api.sume.com/v1/catalog, which needs no key, and find the entry for the product. Each model_pricing row carries price, unit, pricing_basis and the estimated, minimum and maximum cents. Multiply the unit price by your quantity and round only at the end. The catalog also has applied_* fields that include an agent fee of 550 basis points; the figures in this post use the base prices.
Sources
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