Longest 720p AI video under $1.35 per clip, by Sume model

At a $1.35 ceiling per clip and 720p, the longest clip on Sume is 15 seconds on MiniMax H3 ($1.125). The shortest reach in the table is 4 seconds on Seedance 2 Fast. Every number is computed from the estimators that bill Sume jobs, using the Video Router duration limits.

Limits come from the Video Router docs and prices from API pricing, both read 2026-10-10.

Which model runs longest at 720p for $1.35?

Longest first. A model missing from the table has no clip at this tier that fits the ceiling, or does not offer the tier.

How do I set the length?

Send duration in whole seconds with the model id; the request fails if it is outside the model's range.

import os
import time

import requests

H = {"Authorization": f"Bearer {os.environ['SUME_API_KEY']}"}
job = requests.post(
    "https://api.sume.com/v1/videos",
    headers=H,
    json={
        "model": "minimax-h3",
        "prompt": "A paper boat drifts down a rain-soaked street at dusk",
        "duration": 15,
        "resolution": "768p",
        "aspect_ratio": "16:9",
    },
).json()
while True:
    s = requests.get(job["polling_url"], headers=H).json()
    if s["status"] in ("completed", "failed"):
        break
    time.sleep(10)
print(s["status"], s.get("unsigned_urls"))

What this leaves out

A ceiling is arithmetic, not a quality bar.

• Longer clips are not better clips; check the result before scaling a batch.
• Seedance prices assume 16:9; other ratios change the token count.
• Prices can change; re-read the pricing page before budgeting.