Runway Aleph 2 at $0.28/s vs Sume's Gemini Omni edit cost

Editing a 10 second clip with Runway's aleph2 costs $2.80, because Runway's API pricing guide lists it at 28 credits per second and credits at $0.01. The Sume counterpart is gemini-omni-flash-1.1 in video_to_video mode, which bills output seconds at the provider list times 1.25 by resolution: $0.125 per second at 720p, so $1.25 for 10 seconds, with one catch about duration spelled out below.

The two are not the same tool. Aleph 2 and Gemini Omni Flash edit differently and the pages do not give comparable quality claims, so this is a budget comparison only.

Price per second and per clip

Sume's per-second figures come from the fal list for Gemini Omni Flash 1.1 ($0.03, $0.10, $0.15 and $0.30 per second at 360p, 720p, 1080p and 4K) times 1.25.

The duration catch on Sume

Sume's docs describe the edit request as video_url plus a prompt, with resolution optional (default 720p) and no aspect_ratio or duration field. The pricing code explains why that matters: fal takes no duration on the edit endpoint, so the estimator bills an edit as output seconds using a caller duration hint where one exists, and otherwise 8 seconds. At the 720p default, an edit reserved at 8 seconds is 8 x $0.125 = $1.00, whatever the source length.

So for a 3 second source clip the 8 second default means you may reserve $1.00 for a clip whose seconds-based price is $0.375. For short fixes, check the reserve against usage.cost on your first job before you queue a batch.

Twenty edits

Twenty 10 second edits are 20 x $2.80 = $56.00 on aleph2 by Runway's per-second figure. On Sume at the 720p default and the 8 second billing basis they reserve 20 x $1.00 = $20.00, or 20 x $1.25 = $25.00 if your sources are 10 seconds and the hint is honored.

Edits keep the source aspect ratio and cannot be combined with image_url or reference_*_urls, per the Video Router docs. If you need to swap a person rather than edit a scene, a different Sume id (h3-max-recast) is priced per source second instead.