Opus wrote the piano piece, then animated the room

Kevin Ngo's sentence is a pipeline with the software named in order. Claude Opus 5.5 wrote the piano music in Python, created the 3D animation in Python, and rendered it in Blender. No separate composer, no separate animator, in the story he is telling.

Music is the part people still assume was imported. A camera move can look generated and you shrug. A piano line that has to agree with the picture is harder to shrug at, because you can hear a loop, and you can hear a piece that was written for this room.

Python on both the score and the scene is the detail to keep. The model was not prompting a music app and a 3D app. It was writing the files.