>Then hand over to Claude Sonnet.

Have you tried Opus 4.6 with "/effort max" in Claude Code? That's pretty much all I use these days, and it is, honestly, doing a fantastic job. The code it's writing looks quite good to me. Doesn't seem to matter if it's greenfield or existing code.

If code is harder to read than to write, you're doing yourself a disservice by having the output stage not be top shelf.