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> GPT4 is expensive to run, even more expensive to finetune

GPT4 can't even be finetuned at the moment (though I expect that to change).

It can be finetuned. Bing is a finetuned GPT-4.

I'd assume that that "can't" there is about what's publicly available, not what's technically possible.

It’s obviously technically feasible, it’s just not commercially offered…