Putting Muse Wonder and Opus 5.5 in the same S tier has turned Theo Browne’s model rankings into an argument about what a tier even means. A critic, @spartanmadeit, invoked a “brain transplant” over Muse supposedly matching Opus. Theo responded by calling Grok fans “illiterate,” then explained that S tier means models he likes and uses a lot—not identical abilities. Another reader challenged why unequal models shared a tier; Theo said each does things better than the other. These are his preferences, not our benchmark verdict. The ranking itself is older; today’s development is the public row and clarification. You came for help choosing software. Congratulations: you’re now attending a definitions hearing with optional insults. AI can produce mathematical proofs, but apparently liking two models still needs expert witnesses.