Why would a model called "Fast" not advertise the tokens per second speed it performs at? Is "Fast" not representing speed, but another meaning? Is it too variable?
I would guess that it is essentially just a “grok 4 mini”, but if you use mini as the qualifier then most people will be inclined not to use it. If you call it fast then it gives people a reason to select it.
Based on the various benchmarks linked here and in the OP, the name feels justifiable. "Mini" models tend to be a lot worse compared to the base model than this one seems to be.