The Reranker Advantage: Slashing Hallucinations by 40% with Two-Stage Retrieval

Bi-encoder vector embeddings compress entire document chunks into a single 1536-dimensional float vector, losing fine-grained keyword relationships. Here is how adding a Cross-Encoder Reranker in Stage 2 boosts top-3 precision by 40%.

Written and maintained by Hassan Nazir, Forward Deployed Engineer and Applied AI practitioner.