Digital signage 1:4 portrait totem: cost of a 6-creative loop on Sume

A totem screen that is 1:4, such as 1080 by 4320, can be fed images at its own shape: Nano Banana 2.1 lists 1:4 on Sume. A six-creative loop costs $0.60 at 1K and $0.90 at 2K.

Cost of a loop

Price per image times the number of creatives; the ratio does not change it.

Generate the loop

Send one call per creative, or four at a time with n: 4. Read the n range from the model first.

import os, requests

body = {
    "model": "google/nano-banana-2.1",
    "prompt": "Tall lobby display, hot pastry on a plate at the bottom, headline space at the top, warm colors",
    "aspect_ratio": "1:4",
    "resolution": "2K",
}
r = requests.post(
    "https://api.sume.com/v1/images",
    headers={"Authorization": f"Bearer {os.environ['SUME_API_KEY']}"},
    json=body, timeout=60,
)
print(r.status_code)  # 200 = image body, 202 = job envelope
if r.status_code == 200:
    out = r.json()
    print(out["data"][0]["url"], out["usage"]["cost"])

What to check before you buy a tier

• Pixel size: the request sets a resolution tier, not exact pixels. Read the returned file size and check it against the panel. Upscale yourself if the screen is larger.
• Text: keep headlines short and large, and review each frame. Nano Banana 2.1 is improved at text rendering per Google (changelog, read 2026-10-09), not perfect.
• A 4K call may return 202; use mode: "async" for the whole loop.