I used my $200 free fable 5.1 credits to build a WhatsApp sticker maker, it created a version I was not happy with, but it burned the 200 in one sitting. Node.js app, vue frontend, etc.
I didn't used the project a lot since I kind of hate it on how much was spend.
Last week I used just a little bit of my $20 pro account to build a replacement with rust end to end, just to gain some experience with the rust hype. Very happy with the result, not perfect but snappier, and even better: a single executable, I no longer need to fire up a backend and front service separately.
What model did you use for the rust rewrite? Opus 5.5? I mean it seems pretty crazy that you had such different results.