Veo 3.1 is Google's current Veo generation on the Gemini API, sold in three tiers: Standard ($0.40/s at 720p and 1080p, $0.60/s at 4K), Fast ($0.10–$0.30/s) and Lite ($0.05–$0.08/s, no 4K). Audio is included and there is no free tier.
Clips run 4, 6 or 8 seconds; 1080p and 4K require the 8-second setting. Scene extension adds 7 seconds per step, up to 20 steps, reaching roughly 148 seconds from a Veo-generated input.
Veo 3.1-specific controls are first–last frame interpolation and up to 3 ingredient reference images (neither on Lite). Google now positions Gemini Omni Flash as its cheaper default video model (~$0.10/s effective at 720p), with Veo kept for these controls.