Hunyan (https://replicate.com/tencent/hunyuan-video , $0.70/video) is the best but somewhat expensive. LTX (https://replicate.com/fofr/ltx-video , $0.10) is cheaper/faster but less capable.

Both are permissively licensed.

Hunyuan at other providers like fal.ai is cheaper than SORA for the same resolution (720p 5 seconds gets you ~15 videos for $20 vs almost 50 videos at fal). It is slower than SORA (~3 minutes for a 720p video) but faster than replicate's hunyuan (by 6-7x for the same settings).

https://fal.ai/models/fal-ai/hunyuan-video

Hunyuan is a recent one that has looked pretty good.