This has been my experience as well. The best model I have access to right now is Opus 4.8. It's really good at fixing bugs in an established architecture or ad

This has been my experience as well. The best model I have access to right now is Opus 4.8. It's really good at fixing bugs in an established architecture or adding a similar feature, but it's absolutely mid tier at putting together a simple effective architecture for even common software problems. I can tell that functional programming practices are not a large part of it's training material.