This product demo video was entirely made with Claude Fable 5, built on the repo itself, through claude code. It had context of the entire product, it's UI, the theme and features. This made it very easy for it to give me a plan/script and I just had to approve it. The music was generated on gemini via a prompt that claude gave me. I just dropped it back, it analysed the tempo, the beat and planned the scenes accordingly (yeah holy shit)
It found a remotion skill on the web and decided to use it. You be the judge of how good it is. Safe to say it matches an average motion designer's skill level.