Thousand-clip batch: the cents a frame ratio adds on Seedance 2.5

On Sume, a 10-second Seedance 2.5 clip in 4:3 costs 1.7 percent less than 16:9 at 480p, and 0.6 percent more at 720p and 1080p. The 3:4 portrait ratio behaves the same way against 9:16 (read 2026-10-09).

The percentages by resolution

Most pricing tables compare 16:9 with 9:16 and stop. The 4:3 and 3:4 frames are the odd ones, because their pixel counts after rounding do not follow the same step as the others.

Use it in a batch estimate

The effect is tiny per clip, but a batch of 200 clips at 1080p in 4:3 instead of 16:9 adds $17.92. Compute the estimate with the real ratio before you set a cap.

rates = {  # 10 s clip, customer USD, from the Sume price tool (read 2026-10-09)
    ("480p", "16:9"): 2.68677, ("480p", "4:3"): 2.640225,
    ("720p", "16:9"): 5.778, ("720p", "4:3"): 5.814434,
    ("1080p", "16:9"): 14.2155, ("1080p", "4:3"): 14.305094,
}
def batch(n, res, ratio):
    return round(n * rates[(res, ratio)], 2)

print(batch(200, "1080p", "4:3") - batch(200, "1080p", "16:9"))

Where it matters

A single 10-second clip differs by cents. A thousand 10-second 1080p clips in 4:3 cost $14305.09 against $14215.50 in 16:9, a difference of $89.59.

At 480p, a thousand clips in 4:3 cost $2640.23 against $2686.77 in 16:9, so 4:3 saves $46.55.

Both effects are well under the price of one extra resolution step. Moving 1000 clips from 720p to 1080p in 16:9 adds $8437.50.

Gotchas

• These are tool outputs for 10 seconds; the percentages are stable because price scales linearly in seconds.
• Pick the ratio for the placement. A sub-1-percent difference is not a reason to crop or distort.
• auto and adaptive are accepted ratios in the Video Router catalog but pin a real ratio when you budget.
• Always compare usage.cost from completed jobs with your estimate before you scale up.