25 4-second Grok Imagine 1.5 Lite clips vs Sume 480p

xAI's docs list Grok Imagine Video 1.5 Lite at $0.020 per second of output, so 25 4-second clips come to $2.00 direct. Sume does not list the Lite model. It lists grok-imagine-video-1.5, an image-to-video model at 480p and 720p, which bills $1.25 for the same 25 clips.

xAI's figure is from its model page, read 2026-10-10; the page gives one per-second rate and does not split it by resolution. Sume's figures come from the Video Router docs and API pricing.

What does a 4-second clip cost on each route?

The Sume rows are every catalog model that accepts 4 seconds at 480p, cheapest first, with the Grok row included for reference. Sume's Grok row takes a source image; the others also take text-only prompts.

How do I call it?

A text-to-video request goes to POST /v1/videos. This one uses the cheapest text-capable row; Sume's Grok model needs a frame_images entry instead of a text-only prompt.

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": "wan-3.0",
        "prompt": "A paper boat drifts down a rain-soaked street at dusk",
        "duration": 4,
        "resolution": "480p",
        "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 comparison leaves out

The two Grok routes are different products.

• Lite and the model Sume lists are separate xAI releases; do not read the table as the same model at two prices.
• xAI's page does not state the resolution its $0.020 rate applies to.
• Output quality is not compared.