Published Jul 4, 2026By LongStories Team
How long can an AI video be?
Quick Answer
It depends entirely on the tool. Raw text-to-video models stay short — Veo 3 at 8 seconds, Sora 2 at 15–25, Runway ~20 — while scene-based tools like InVideo AI and LongStories.ai reach about 15 minutes and Synthesia up to 30.
Raw text-to-video models generate short clips — Veo 3 caps at 8 seconds, Sora 2 at 15–25, Runway ~20 — because generating frame by frame is costly and quality drifts. Scene-based, script-to-video tools instead stitch many segments into one timeline: InVideo AI and LongStories.ai reach about 15 minutes, Synthesia up to 30. So the tool's design, not any single model, sets your ceiling.