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Pinecone vs Weaviate vs pgvector vs OpenSearch (ANSWERED)

Scenario BasedRAGMedium15 min read

Medium RAG interview question on pinecone vs weaviate vs pgvector vs opensearch — architecture, trade-offs, eval, and production patterns.

TL;DR — Quick Answer

Pinecone: managed, low ops, strong SaaS story. Weaviate: hybrid modules, flexible schemas. pgvector: best when data already in Postgres. OpenSearch: mature BM25+kNN for AWS/Elastic teams — choose on ops model, hybrid needs, and existing stack.

The Interview Question

Explain pinecone vs weaviate vs pgvector vs opensearch. How would you design, implement, and evaluate this in a production RAG system? Discuss trade-offs and failure modes.

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