Veo 3.1 Lite vs Grok Imagine 1.5 Lite for short AI video

Veo 3.1 Lite and Grok Imagine 1.5 Lite are the lower-cost video tiers from Google and xAI. Each one builds a short clip with sound from a text prompt or a single starting image. Both run in Picsart AI Playground, so one prompt can go through both.