A reality check on the 12B coding model everyone is posting about: real GGUF file sizes, JetBrains' own benchmark table, and the hardware most of us actually have. Every post about JetBrains Mellum2.1 says a version of the same sentence: a 12B model that runs like a 2.5B one. That is a real property of mixture-of-experts — 12B total weights, about 2.5B active per token — and it is why the model fits on cards that a dense 12B would not. What none of those posts give you is the download siz...