24-second AI video API: only Wan 3.0 and Seedance 2.5 reach it

Two models on Sume accept a 24-second request: Wan 3.0 (wan-3.0, 2 to 30 seconds) and Seedance 2.5 (seedance-2.5, 4 to 30 seconds). Every other model in the video catalog tops out at 15 seconds, so a 24-second job on any other id is outside that model's listed range. For Wan 3.0 the price is $1.50 at 480p, $3.00 at 720p and $6.00 at 1080p.

Which models accept 24 seconds

The video models listing (GET /v1/videos/models) reports supported_durations per model. The Sume docs state the limits in one sentence: seedance-2.5 accepts 4 to 30 seconds at 480p, 720p and 1080p, wan-3.0 accepts 2 to 30 seconds, and every other catalog model except the source-video models tops out at 15 seconds.

• Wan 3.0: 2 to 30 s, 480p, 720p, 1080p, aspect ratios auto, adaptive, 16:9, 4:3, 1:1, 3:4 and 9:16.
• Seedance 2.5: 4 to 30 s, 480p, 720p, 1080p, with 21:9 added to the same list.
• Genjutsu and H3 Max Recast also reach 30 s, but they transform a source video you supply, so their length follows that clip rather than a duration you choose.

What Wan 3.0 costs for 24 seconds

Sume bills the provider list price multiplied by 1.25 and rounded up to the cent. The balance is reserved when you submit, so you can read the figure below before the job starts. 24 s is a single clip, not a stitch of two 12 s ones.

Submit it

The request is the OpenRouter-compatible POST /v1/videos. Send an Idempotency-Key so a retry after a timeout does not create a second billable job.

curl -X POST "https://api.sume.com/v1/videos" \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: wan-3.0-24s-001" \
  -d '{
    "model": "wan-3.0",
    "prompt": "A slow dolly shot through a greenhouse at dawn",
    "duration": 24,
    "resolution": "480p",
    "aspect_ratio": "16:9"
  }'

Check the limit before you pay

Do not hard-code the 30 s ceiling. Read supported_durations from GET /v1/videos/models at runtime and fall back to a shorter clip if the id you want is absent. Check the envelope first so a request outside it is not submitted at all.

Where to go next

If your plan needs more than 30 seconds, split it into scenes and join the clips with the Timeline endpoint ($0.10 per output minute in the Sume docs). The related posts below cover the neighbouring lengths one by one.