Most AI video generators are diffusion transformers. They start from random noise across many frames at once and refine it step-by-step into a coherent clip — guided by a text encoder that converts your prompt into a vector the model can follow. The hard part isn't any single frame; it's temporal consistency: keeping subjects, lighting, and camera motion coherent over time.
Rankings use TrueSkill (conservative rating: μ − 3σ) from blind human comparisons in the Video Arena. Each prompt generates 4 videos from randomly sampled models. Users watch the clips and pick the best and worst — without seeing model names or providers. This ensures rankings reflect actual generation quality rather than marketing claims or cherry-picked demo clips.
The leaderboard covers three distinct arenas. The text-to-video arena evaluates generation from text prompts — testing motion quality, scene coherence, and visual fidelity. The image-to-video arena tests how well models animate a reference image while preserving its composition and style. The video editing arena evaluates instruction-based modifications to existing clips — style transfer, object removal, and scene changes.
Video generation costs vary significantly. Some models charge per second of output, others per generation regardless of duration. Resolution and duration both affect pricing. The scatter view in the rankings tab shows quality vs. cost so you can find the best AI video generator that fits your budget for production use cases like ad creative, social content, or motion design.