Woah, this is a marked improvement. I just threw a relative complex coding problem at it and 3.5 sonnet did a really good job across several language. I asked it to rewrite a Qt6 QSyntaxHighlighter subclass to use TreeSitter to support arbitrary languages and not only did it work (with a hardcoded language) but it even got the cxx-qt Rust bindings almost right, including the extra header.

Curious to see how well it handles QML because previous models have been absolutely garbage at it.