I use sonet 3.5 and while it's actually usable for codegen (compared to gpt/copilot) it's still really not that great. It does well at tasks like "here's a stinky collection of tests that accrued over time - clean this up in style of x" but actually writing code still shows fundamental lack of understanding of underlying API and problem (the most banal example being constantly generating `x || Array.isArray(x)` test)