I asked Opus 5.5 for a bouncing ball that plays Mary Had a Little Lamb. It came back with 7 songs, 8 synths

Opus 5.5 is the first model I've used that doesn't just write code. It checks it. I started with one sentence: make the viral animation where a ball bounces and plays Mary Had a Little Lamb. A few conversations later I have a full 3D music visualizer: \* A character hops down a winding staircase, one step per note. The step heights trace the melody, so you can literally see the tune \* A second mode where a glowing ball drops through a dark room, lighting up orbs that stay lit behind it \* Two smaller balls that play the left hand accompaniment (waltz for the anthem, stride for The Entertainer, arpeggios for Für Elise) \* 7 public domain songs, 8 synthesized instruments, tempo and camera controls \* Export straight to MP4 in landscape, vertical or square The part that sold me: it ran its own QA. It spun up headless Chromium, rendered frames across every song and screen size, measured whether the balls stayed on screen, built contact sheets, looked at them, and fixed what…