My bad — I had Max, so more than $20. I can’t edit the comment any more. Can’t keep track of the names. I wonder when ‘pro’ started to mean ‘lowest tier’.

But your article is interesting. You think some of the degradation is because when I think I’m using Opus they’re giving me Sonnet invisibily?

Hard to say, but the fact is the intelligence was there and now it's not.

Maybe they are giving Sonnet, or maybe a distilled Opus, or maybe Opus but with lower context, not quite sure but intelligence costs compute so less intelligence means cheaper compute.