Sume motion routes by length: Kling, Recast and Genjutsu

Sume offers three ways to drive a result from a source clip, and each one handles length differently. Kling 3.0 Motion Control needs duration_seconds from 1 to 30 and its output follows the driving video. H3 Max Recast takes 5 to 30 seconds and uses the source video's length rounded up. Higgsfield Genjutsu, listed only when its provider is configured, accepts 4 to 30 seconds. Know which rule applies before you send a long clip.

Prices matter here because all three bill per second of output.

The three length rules

Ranges and resolutions are from the catalog and the Kling route; confirm the live rows.

What Kling costs by length

Kling Motion Control's list is $0.126 per second in Sume's pricing table, so with the 1.25 margin it is about $0.1575 per second. A 5-second clip is about $0.79 and a 30-second clip about $4.73, rounded up to the cent. There is no resolution knob: the standard route has none, and output length follows the driving video.

• 5 s: about $0.79.
• 15 s: about $2.37.
• 30 s: about $4.73.

A Kling request

Fields are exactly those the schema accepts: image_url, motion_video_url, duration_seconds, and optional prompt, keep_original_sound and character_orientation. Both URLs must be public HTTPS addresses.

curl -X POST https://api.sume.com/v1/kling/3.0/motion-control \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: kling-mc-len-001" \
  -d '{
    "image_url": "https://example.com/character.png",
    "motion_video_url": "https://example.com/dance-8s.mp4",
    "duration_seconds": 8,
    "character_orientation": "video"
  }'

How to pick

If the photo should perform someone else's motion, use Motion Control. If people in an existing clip should be replaced, use Recast. If neither fits because you need a different framing, generate a new clip on a reference row. Avoid padding: a 12.4-second Recast source bills as 13 seconds. Read the Video Router page, the MCP tools page for kling-motion-control_create, and the API reference.