Sadly this does not seem to be the case here: if you read the announcement entirely, they include a "cost per task" metric which basically continues the trend of their previous models. So yes, tasks will cost you more, but results will be better - allegedly.
after playing for the three days - yeah, that turned out to be the case. Fable was more precise, did more tests and cost much more than 2x for the same task.
For some tasks though Opus was performing poorly and Fable managed to do them well on a first try.