For some tasks I genuinely feel Opus 5.5 does better on low than medium or high. The trouble, as always, is figuring out which.
Edit: I realize after commenting that you're not suggesting medium is useless, but just arbitrary and differs between models. Personally I don't want to directly compare mediums between models, I just want to be able to compare across effort levels.
i run opus on medium, sonet on high, and haiku on high for implementation based how complicated is for planing and specing and review opus is on high usually, except if if the task is contained.
did not try to run it on low, will have to try it.