Originally published on AI Tech Connect.
What you need to know Two years ago, every retrieval-augmented-generation tutorial named a different vector store, and choosing one felt like a bet on which start-up would survive. That anxiety is largely over. By 2026 the market has consolidated to four production defaults — pgvector, Qdrant, Pinecone and Weaviate — with Milvus and its managed sibling Zilliz waiting for the billion-scale workloads the other four are not built for. The hard part is no longer finding a credible option. It is resisting the urge to over-buy: to reach for a distributed, purpose-built vector engine when a single Postgres extension would have served you for years. This guide is written for the builder shipping a real product in India or the UK, not for a benchmark leaderboard. The short version is that the…
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