I've been making a lot of use of DaisyDisk over the past year: https://daisydiskapp.com
DaisyDisk is such a nice app. I just checked and I purchased it over 11 years ago.
They still update it, it works perfectly, no version 2.0 forced obsolescence. Just a nice, reliable tool.
DaisyDisk is great. Mole also found and deleted a bunch of stuff on my mac from Claude, Gemini, etc.
I’ve been using it altogether too much this last month and just bought a 4TB USB4 SSD.
And yes, codex is eating my disk, too. Ironically my solution is mostly codex - I have a task which goes around stomping on detritus.
Mole is ok too
TUI version is free, though there is a paid app if that’s your thing
https://github.com/tw93/Mole