Two AI video generators, side by side. Facts below link to their sources; last checked 2026-10-17.

AI video platform. Gen-4 keeps characters, locations and objects consistent across shots; Gen-4.5 improves motion and prompt adherence. source

AI video platform for talking avatars and digital twins: record yourself once, then generate presenter videos, translations and edits from text. source
Runway: Gen-4.5 video generation with consistent characters and worlds. HeyGen: Turn one recording into a realistic AI avatar that presents any script.
Runway: From $15/month (free tier available). HeyGen: From $29/month (free tier available). Prices change often; confirm on the official pricing pages.