Luma Ray3.2: a 10-second clip costs 3x a 5-second one, so stitch two

On Luma's Ray3.2 text-to-video and image-to-video, a 10-second clip costs exactly 3x the 5-second price: $0.45 against $0.15 at 540p, $0.90 against $0.30 at 720p and $3.60 against $1.20 at 1080p. Two 5-second clips therefore cost two thirds of one 10-second clip, and you can stitch them. The prices are from the Luma API pricing page (read 2026-10-04).

On Sume, video models bill per output second, so a 10-second Gemini Omni Flash 1.1 clip is exactly twice the 5-second price, $1.25 against $0.625 at 720p.

What the numbers say

Per second, Luma's 5-second clip at 540p is $0.15 / 5 = $0.03 and the 10-second clip is $0.45 / 10 = $0.045, 1.5x as much. At 1080p it is $0.24 per second against $0.36. Longer is more expensive per second, so the cheapest way to 10 seconds is two 5-second takes.

Stitching saves $0.15 at 540p, $0.30 at 720p and $1.20 at 1080p per 10 seconds. Over 100 finished 10-second shots at 1080p that is $120, since 100 x $1.20 = $120.

The catch with stitching

Two separate generations are two different takes: a subject can change between them, and a hard cut shows at the join. Using the last frame of the first clip as the first frame of the second reduces the drift, and Timeline can join the two with a short transition. A Timeline render is $0.10 per output minute rounded up, so a 10-second join is $0.10, which still leaves the stitched 1080p shot at $2.40 + $0.10 = $2.50 against $3.60.

Sume's Timeline 1.0 accepts up to 200 video slots with fade, dissolve and wipe transitions.

• Single continuous move across 10 seconds: pay for the 10-second clip.
• Two beats in one shot: stitch and save.
• Everything above 5 seconds on Luma: compare to the per-second Sume rows first.

Steps

• Write the 10-second action as two 5-second beats.
• Generate beat one, take its last frame, and use it as the first frame of beat two.
• Join with a short fade in Timeline.
• Compare the finished price to the 10-second clip.

A 30-second sequence

Thirty seconds of finished video at 720p is three 10-second clips at 3 x $0.90 = $2.70 or six 5-second clips at 6 x $0.30 = $1.80. At 1080p the same choice is $10.80 against $7.20. The longer the sequence, the more the shorter shot length saves.

Caveats

The 3x ratio holds in the three rows read on 2026-10-04 and may change with the page. Reframe, HDR (2x) and video-to-video use different prices. The ratio on Sume is linear, but Sume's model is not Ray3.2, so quality is not equivalent.