Interestingly, I started coding with Claude a couple weeks ago (with my only other experience being vbcode 20 years ago) and it's been surprisingly good at starting code from scratch but as soon as the code gets a little complex it takes a lot of tokens to make a simple change which makes it somewhat impractical for all but the most basic applications. That said, I'm not referring to objects by inspecting the code and asking for changes to certain lines, I'm saying "In the results bar, change the title of the result to a clickable link that directs to X." which may require a little translation before Claude picks up on what I want. Even so, I was able to build a somewhat usable application within a week (minus a few bugs).
It makes sense that CC uses more tokens on bigger and complex code bases. And I'm happy it does; because of that it gets a good understanding of the architecture and how to properly solve the issue. And yeah for that you need at least a 5x plan.