Is that statement based on token price? More and more it seems that $/token hides as much as it reveals. Token efficiency, tokenizer differences, etc. I'm not saying that you are wrong, I am just saying it is becoming a bit more difficult making statements like this without a bit more research.

It's based on the Artificial Analysis "Intelligence Index vs. Cost per Intelligence Index Task" here:

https://artificialanalysis.ai/#intelligence-comparison-tabs

Differences in token "density" are accounted for by pricing per task