Yes, in some fanfictions, Percy can be depicted as smarter. Writers might explore different aspects of his character, like his battle instincts translating into a different kind of intelligence compared to Annabeth's more academic and strategic smarts.
In fanfiction, the definition of'smarter' can be very flexible. Percy could be seen as smarter if the fanfic focuses on his emotional intelligence or his ability to think on his feet in chaotic situations. Annabeth is known for her book - smartness in the original series, but fanfiction can re - imagine Percy having a deeper understanding of certain mysteries or having unique insights that outshine Annabeth in that particular story's narrative.