A monthly AI video budget calculator in Python using Sume rates

A monthly video budget is a sum of three numbers per line: seconds per clip, clips per month and rate per second. Everything else is a fixed price per job. Sume bills the per-second models at the provider list price times 1.25, so the inputs are on the vendor pages and the rate card.

The plan below is an assumption for illustration: 120 six-second drafts at Wan 3.0 480p, 30 ten-second posts at Wan 3.0 720p with captions, and 4 ten-second Kling 3 Pro clips with audio on and captions. Captions are $0.20 per job for videos up to 60 seconds.

The result

The calculator

It uses Decimal, so the figures are exact. Change the plan list and rerun. The rates are for 2026-10-05; read the live values from the model catalog before you rely on them.

from decimal import Decimal

SUME = {  # Sume USD per second (provider list x 1.25), read 2026-10-05
    "wan-480p": Decimal("0.0625"),
    "wan-720p": Decimal("0.125"),
    "omni-720p": Decimal("0.125"),
    "kling3pro-audio": Decimal("0.21"),
}
FIXED = {"captions": Decimal("0.20"), "music": Decimal("0.125")}

plan = [  # (model, seconds per clip, clips per month, captions per month)
    ("wan-480p", 6, 120, 0),
    ("wan-720p", 10, 30, 30),
    ("kling3pro-audio", 10, 4, 4),
]
total = Decimal(0)
for model, secs, clips, caps in plan:
    cost = SUME[model] * secs * clips + FIXED["captions"] * caps
    total += cost
    print(f"{model}: {cost}")
print("month total:", total)

Using it

The 120 drafts cost $45.00 in total. The four Kling clips cost $9.20, so each captioned Kling clip costs as much as 6.1 drafts, which is the case for being deliberate with premium tiers.

Compare the total against your wallet. Top-ups are $10 to $1,000 per checkout; the billing and credits docs explain how the balance is read and how usage is recorded.

• Edit the plan, not the code.
• Keep a column for the settled usage.cost to check your estimates.
• Revisit the rates when a vendor announces new pricing.