X has only brand recognition right now, and an extremely toxic one.
Big customers may buy but won't give them logos, people who are offended by Musk's worldview won't pay them either. You don't do well with a toxic brand: just look at Ye having to buy full page apologies ads to try and sell a record.
X?
Don't they have the biggest budget and largest GPU farm?
Also grok-4.1-fast was one of the top models for a long time, especially in real world usage.