Grok Imagine Video for 30 seconds: two 15 s jobs, $0.375, silent

Grok Imagine Video 1.5 is the lowest per-second video row in the Sume catalog I read on 2026-10-07: $0.0125 a second, 480p or 720p, 4 to 15 seconds per job, and no audio track. Thirty seconds is therefore two 15-second jobs, not one.

Two jobs at 15 s is 30 s x $0.0125 = $0.375. A Timeline render to join them is $0.10 per output minute, so a joined 30-second file is $0.475 before any sound.

Against the other 30-second routes

Single-pass models take 30 s in one job. Others need stitching. All prices are billable rates already including Sume's margin.

The silent-track problem

Grok has no audio, so a finished ad also needs voice or music. Text to speech is $0.0475 per 1,000 characters and music is $0.125 per track. Add those and the Grok route is still under a dollar for 30 seconds, which is the reason to use it for rough cuts and animatics rather than the final render.