Earlier quoted context omitted.
Check out the BLOOM models if you want to see a first stab at that. If you can find an economical way of running it though, let me know.
A cluster of 6 year old 24GB NVIDIA Teslas should do the trick...they run for about $100 apiece. Put 12 or so of them together and you have the VRAM for a GPT3 clone.
But yes, it's a very good value.