Apparently some folks don't get "data-driven physics engine", so let me clarify. Sora is an end-to-end, diffusion transformer model. It inputs text/image and outputs video pixels directly. Sora learns a physics engine implicitly in the neural parameters by gradient descent through massive amounts of videos.
Sora is a learnable simulator, or "world model". Of course it does not call UE5 explicitly in the loop, but it's possible that UE5-generated (text, video) pairs are added as synthetic data to the training set.
"Happy Chinese New Year" ≈ "Merry Christmas";
"Happy Lunar New Year" ≈ "Happy Holidays".
This mistranslation initiated by anti-China politicians from Taiwan, is fooling more and more foreigners.