AWS Bedrock Knowledge Bases: Comparing S3 Vector Store, OpenSearch, PostgreSQL, and Neptune for Cost and Performance

Since July 15, 2025, AWS has added support for S3 vector stores for Bedrock knowledge bases, allowing for seamless storage and retrieval of embeddings for RAG workflows. Currently, it supports multiple stores: AWS-Managed Non AWS-Managed OpenSearch MongoDB Atlas S3 vector store Pinecone PostgreSQL Redis Enterprise Cloud Neptune