pgvector vs Pinecone vs Qdrant: Benchmarked for RAG in 2026

TL;DR Start with pgvector if you already run Postgres: on 100,000 OpenAI embeddings it hit 0.948 recall@10 at 1.45 ms with defaults and 0.988 at 4.0 ms with ef_search 200. Qdrant 1.19 hit 0.985 at 2.6