But Claude Sonnet 3.5 w/ Cursor or Continue.dev is a dramatic improvement. When you have discrete control over the context (ie. being able to select 6-7 files to inject), and with the superior ability of Claude, it is an absolute game changer.
Easy 2-5x speedup depending on what you're doing. In an hour you can craft a production ready 100 loc solution, with a full complement of tests, to something that might otherwise take a half day.
I say this as someone with 26 yoe, having worked in principal/staff/lead roles since 2012. I wouldn't expect nearly the same boost coming at less than senior exp. though, as you have to be quite detailed at what you actually want, and often take the initial solution - which is usually working code - and refine it a half dozen times into something that you feel is ideal and well factored.
Among other things, it accepts an arbitrary key, and will always generate the same avatar for the same key. Very handy for apps which need to generate user-specific avatars.