In those situations you basically need to guide llm to do it properly. It rarely one shots complex problems like this, especially in non web dev, but could make it faster than doing it manually.

Agree on the gap - in my own complex greenfield software dev spec test, opus 4.6 blows codex 5.3 out of the water, by wide margin, both in ui and backend.

It’s probably something really dumb, and they irked California billionaire with their idiocy.