Rerankers Aren’t Magic Either: When the Cross-Encoder Layer Is Worth the Cost

# Rerankers Aren't Magic: When Expensive AI Tools Actually Help If your company is using AI to search through documents, you might be tempted to add a "reranker"—an extra AI layer that's supposed to improve results by reordering what you find. But this new analysis shows that rerankers can't fix fundamental problems with weak search systems; they only work well when your basic search is already reasonably good. Before spending money on this extra tool, companies should focus on getting their initial search quality right first.