No, but it will do the opposite You can choose Sonnet and set "/advisor opus" and it will reach up when it thinks it needs to.

OTOH, would you trust the vendor to pick the best model for you? Would you trust them not to prioritize their own load-balancing concerns first?

The descriptions are near-useless and tend to flip around, as model families are not released in sync anymore, that's true, but fortunately, thanks in a big way to subscription pricing, the choice is simple: start with the best model on offer, and when you run out of quota, downgrade to the next best (or briefly switch providers).