what they changed was peak vs off-peak usage metering.
using it on the weekend gets you more use than during weekdays 9-5 in US eastern time.
I'm surprised it's during east coast working hours and not west coast.
Technically, this was Friday morning, so I think I was still in peak hours.
I waited until off peak hours to use Opus 4.6 to do some research. One prompt consumed 100% of my 5h limit and 15% of my weekly usage. Even off peak it's still insane. Opus didn't even manage to finish what it was doing.