## The Reversal Curse: Why a Language Model That Knows “A Is B” Can’t Tell You “B Is A” A model can recall a fact in the direction it learned it and fail in the other. Here's a toy version of why Say a friend tells you their dog’s name is Biscuit. Later, at the park, a stranger points at a dog and asks if you know whose it is. If that dog happens to be Biscuit, you’d probably recognize it. The fact “Sam’s dog is named Biscuit” works in your head whichever direction someone approaches it from, and that flexibility feels so basic we don’t notice we’re relying on it. A 2023 paper by Berglund and…