Six angles of one product: Nano Banana 2.1, two calls, $0.90 at 2K

Six angles of one product from a single photo cost $0.90 at 2K on Sume with google/nano-banana-2.1: one call with n: 4 and one with n: 2, six images at $0.15 each. The catalog caps n at 4 for this model, so six images cannot go in one request.

Request plan

Send the product photo as the only entry in input_references on both calls and keep the prompt wording identical except for the angle list. Nano Banana 2.1 accepts 0 to 10 references on Sume, so one photo leaves room to add a second reference, such as a logo, later.

One prompt per call returns variations of that prompt, not a fixed set of angles. If you need exactly front, back, left, right, top and three-quarter, make six single-image calls with one angle per prompt instead. The price is the same, since billing is per image.

Prompt pattern

Name what must not change, then the one thing that does: "Keep the bottle, label and cap identical. Show it from directly above on a white sweep, soft shadow." Use aspect_ratio: "auto" so the output keeps the shape of your photo; per the docs, leaving the field out is not the same.

When one reference is not enough

Google's pricing page promises multi-turn character consistency for Nano Banana 2.1, but that describes a chat flow. The Sume API is a single request per image, so consistency comes from the reference you send. If an angle drifts, add a second photo of that side of the product as another reference.

Cost of the retry rule

If a call returns a bad angle, the fix is one more image, not a re-run of the set. Budget a 25% retry allowance: for six images at 2K that is 1.5 extra images, round up to 2, or 2 x $0.15 = $0.30. With the allowance the six-angle set costs about $1.20 at 2K.

For 50 products the arithmetic scales: 50 x $0.90 = $45.00 for the base set and about $60.00 with the retry allowance (50 x $1.20). At 1K the same plan is $30.00 base, $40.00 with retries.

Keep the original photo in every call. Chaining, where you edit the previous output, accumulates drift, because each step is a fresh generation.

What this plan does not cover

Cost: the Sume price is per image, so the plan does not change with the number of calls. Quality: nothing here claims that six angles will match each other. Test one product first and look at the label, the proportions and the cap on each angle before you run a catalog.

Rights: only upload photos you have the right to use. Reference URLs must be public HTTPS, and Sume rejects localhost, private-network and non-HTTPS URLs before submission, so a photo on a private bucket needs a signed public link first. The media inputs docs describe the rules.