Runway Aleph 2.0 vs Gemini Omni Flash edit as a Sora remix swap

Two practical video-to-video replacements for a Sora remix call are Runway's Aleph 2.0 and gemini-omni-flash-1.1 in edit mode on Sume. Runway lists Aleph 2.0 at $0.28 per second; Sume bills the Omni 720p rate of $0.125 per second, and its edit mode takes a video_url plus a prompt describing the change.

What remix did

OpenAI's guide marked the remix endpoint as deprecated, and the Videos API itself was shut down on September 24, 2026. Remix meant sending a finished video id plus a new prompt. Both options below replace that with a source video you hold yourself, so you need the original file, which is another reason to export your assets now.

The price gap deserves context. Runway's $0.28 per second for Aleph 2.0 and Sume's $0.125 at 720p are different models doing different jobs, so a cheaper edit is only a saving if its output is good enough for the shot. Compare on one clip you care about, not on the rate card.

Side by side

Runway's models page, read 2026-10-07, also lists Gen-4.5 at $0.12 per second and Gen-4 Turbo at $0.05 for generation, which makes a Runway account a viable one-stop alternative if you prefer its tooling. The same page lists Seedance 2.5 from $0.20 per second, so check which vendor's price you are comparing before you compare.

What the Sume edit accepts

Edit mode on Sume is limited by what the model sees: up to 10 reference images, up to 3 reference videos of at most 3 seconds each, and a prompt of up to 20000 characters. The prompt can address inputs with tokens such as <IMAGE_REF_0> and <VIDEO_REF_0>. The limits post lists them.

Budgeting an edit

Because the duration on an edit is only a reserve hint, quote per-second rates to your users and read the final charge from the job. Do not multiply the hint by the rate and call it the price. Runway, by contrast, documents per-second pricing for Aleph 2.0 directly on its models page.

For the Sume side, run the edit once at the default 720p and read usage.cost from the finished job. Use that number, not an estimate, when you set a per-edit price for your own users.

Choosing

Pick Runway if you already hold a Runway account and want its editing tooling. Pick Sume if you want the edit to sit behind the same /v1/videos call, key and webhook as your generation jobs. The Sora remix post walks through the request.