Best Sora Alternatives 2026: 7 Free and Open Source AI Video Generators

Need AI video generation but Sora is too expensive or unavailable?

OpenAI Sora is the most famous AI video generator but not the only option. Runway Gen-3 costs 35/mo with 9/10 quality. Kling 1.6 has free tier with 8/10 quality. Stable Video Diffusion is free and open source. Real test data from July 2026 shows Kling generates fastest in 20 seconds.