18-second 1080p product spin on Seedance 2.5: $25.59, split or single

An 18-second 16:9 Seedance 2.5 clip costs $25.59 at 1080p and $10.40 at 720p on Sume. Splitting it into two 9-second or three 6-second jobs lands within a few cents of the single-job price (read 2026-10-09).

Single job against split

A product spin is a slow orbit, and it can be one continuous shot. Seedance 2.5 takes up to 30 seconds per job, so 18 seconds does not require splitting. The table shows what a split would cost anyway.

Balance and holds

At submit Sume reserves the full amount, so the 1080p single job needs $25.59 available. If the balance cannot cover it, the request returns 402 insufficient_credits. A split into three jobs reserves three smaller amounts instead of one large one.

import os, time, requests

API = "https://api.sume.com/v1/videos"
H = {"Authorization": "Bearer " + os.environ["SUME_API_KEY"]}
body = {"model": "seedance-2.5", "prompt": "Slow 360-degree orbit around a matte-black watch on a rotating marble plinth, soft rim light", "duration": 18, "resolution": "1080p", "aspect_ratio": "16:9"}
job = requests.post(API, headers={**H, "Idempotency-Key": "watch-spin-001"}, json=body, timeout=60).json()
deadline = time.time() + 1800
while time.time() < deadline:
    time.sleep(30)
    job = requests.get(job["polling_url"], headers=H, timeout=60).json()
    if job["status"] == "completed":
        print(job["unsigned_urls"][0], job["usage"]["cost"])
        break
    if job["status"] in ("failed", "cancelled"):
        print(job["status"], job.get("error"))
        break

Three product spins

Three spins at 18 seconds and 1080p cost 3 x $25.59 = $76.76. If the three are submitted at once, Sume reserves $76.76 before any of them completes.

At 720p the same three cost $31.20, and a 480p draft round of three costs $14.51.

Because a hold is reserved per job, stagger large batches to match your balance instead of submitting everything at once. The 402 response comes at submit time, before a job is created.

Checks

• Prove the orbit at 480p first. At 18 seconds the draft costs $4.84.
• A failed job releases or refunds its reservation where applicable, so the hold does not stay on the balance.
• Cancel is allowed only before generation starts.
• Single-job continuity is the main reason to avoid splitting an orbit; the price is not.