18-second H3 Max Recast person swap: $6.75 at 768p, $10.13 at 1080p

Swapping the people in an 18-second video with H3 Max Recast (h3-max-recast) on Sume costs $6.75 at the default 768p and about $10.13 at 1080p. The price is the source video length, rounded up to whole seconds, times the fal list of $0.30 or $0.45 per second (fal 2026-10-01), times Sume's 1.25 margin.

Recast keeps the source's motion, camera, cuts, and sound, and replaces each person with one you supply as a photo. It does not generate a new scene.

The math for 18 seconds

The duration is the length of the source video, so you do not choose it. Sume bills ceil of the source length. Eighteen seconds is exactly 18.

What the route accepts

An 18-second source with one 10-second shot and one 8-second shot is fine. An 18-second single take is not, because of the 15-second shot limit. Cut such a clip before you send it.

• One source video as video_url, 5 to 30 seconds, with no single shot longer than 15 seconds.
• One to four photos in reference_image_urls, one for each new person.
• An optional prompt of up to 2,000 characters.
• No text-only generation, and no aspect_ratio: the source sets the frame.

A request

Send the job through Video Router with an idempotency key, so a retry after a timeout does not create a second job.

curl -X POST https://api.sume.com/v1/video-router/generate \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: recast-18s-001" \
  -d '{"model": "h3-max-recast", "video_url": "https://example.com/source.mp4", "reference_image_urls": ["https://example.com/new-person.png"], "resolution": "768p", "mode": "async"}'

Draft at 768p, ship at 1080p

The 1080p upgrade adds $3.375 on this clip. Run the 768p version first, check that the swap holds on every cut, and re-run at 1080p only for the final. A failed job is refunded; a completed job with a face you dislike is not.

If the source is only a face to replace and the clip is 4 to 15 seconds with usable audio, the beta Avatar Face Swap is another route, compared in face swap against H3 Max Recast. MiniMax's H3 announcement lists video, image, and audio references as inputs to the H3 model (read 2026-10-07); Recast is a separate Sume row with its own rules above.