What type of system is needed to self host this? How much would it cost?
Depends on fast you want it to be. I’m guessing a couple of $10k mac studio boxes could run it, but probably not fast enough to enjoy using it.
One GB200 NVL72 from Nvidia would do it. $2-3 million, or so. If you're a corporation, say Walmart or PayPal, that's not out of the question.
If you want to go budget corporate, 7 x H200 is just barely going to run it, but all in, $300k ought to do it.
$20K worth of RTX 6000 Blackwell cards should let you run the Flash version of the model.
Depends how many users you have and what is "production grade" for you but like 500k gets you a 8x B200 machine.