I audited my AI setup last week.

Found 6 places i was just burning money for no reason.
The one that hurt most: i had Opus running on tasks Haiku could've handled for 25x less. Not because i needed Opus.. just because i never changed the default.
That's the real problem with AI costs right now.
It's not that the tools are expensive.
It's that nobody audits them.
You set it up once, move on, and the meter keeps running.
Crons firing 288 times a day for a task that needs 4.
Agents summarizing content you stopped reading in month 2.
Debug logs still on in production, hitting the API on every test.
Overlapping subscriptions you're using at 30% each.
None of it feels expensive in isolation.
Together it's a $400 day you find out about when the invoice lands.
The fix isn't switching tools.
It's spending 2 hours every 90 days asking: does my setup still match how i work?
Mine didn't. Probably yours doesn't either.