I recently vibe-coded a finance app so that my wife and I could save a few hours each week not having to do the admin part of weekly finances. The project was the biggest one I’ve built yet in terms of token usage (~1.78 billion tokens) due to multiple iterations over weeks of us using it and finally taking it online so my wife and I could use it on the go. I’m assuming token-efficiency is important to people building helpful things. Here is how my latest token-efficiency review went with Claude.