Oh wait, I misinterpreted you as using “much worse” to mean “much scarier”, when instead you mean “much less capable”.
I’d be glad if it were the case that RL*F doesn’t hide any meaningful capabilities existing in the base model, but I’m not sure it is the case, and I’d sure like someone to check! It sure seems like RL*F is likely in some cases to get the model to stop explicitly talking about a capability it has (unless it is jailbroken on that subject), rather than to remove the capability.
(Imagine RL*Fing a base model to stop explicitly talking about arithmetic; are we sure it would un-learn the rules?)
How certain are you that this is always true (rather than “we’ve usually noticed this even though we haven’t explicitly been checking for it in general”), and that it will continue to be so as models become stronger?
It seems to me like additionally running evals on base models is a highly reasonable precaution.