Build a RAG Pipeline 2026: Voyage-3, pgvector & Cohere Rerank
Build a RAG pipeline 2026 with Voyage-3 embeddings, pgvector search, and Cohere Rerank. Learn why RAG still wins and how to ship a production-ready stack.
Chapter 1: Why RAG Still Wins in 2026: Context, Tradeoffs & the Modern Stack Every year since 2023, someone has declared retrieval-augmented generation dead. First it was going to be killed by bigger context windows. Then by fine-tuning. Then by agents that could just "search the web themselves." Yet here we are in 2026, and RAG is not only alive — it's the default architecture for any serious application that needs a model to reason over data it wasn't trained on. This chapter explains why, sets the boundaries of when RAG is the right call, and introduces the exact stack...