The best AI video generator delivers usable results at the lowest total cost. As of August 10, 2026, Seedance 2.0, Gemini Omni Flash, Veo 3.1 Lite, Kling 3.0, Runway, and leading open-source models each suit different needs. This guide compares their quality, cost, and speed, then explores a cost-effective workflow: generate at 720p or 1080p, select the best shots, and upscale them to 4K. This approach can reduce costs when multiple generations are needed, with AI upscaling tools like UniFab and Topaz providing a practical path to 4K output.