My argument is that if you were to compare "analyze XYZ geopolitical situation" or "explain the ramifications of XYZ law" from Opus 3.5, 4.5 and 5.5, the difference would be marginal, at least for 4.5 - 5.5. Almost all the crazy capabilities newer models have is from RLVR variants, whereas capabilities driven by RLHF are inching along.