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Direct Comparison

AWS RDS PostgreSQL (pgvector) vs AWS OpenSearch Serverless pricing

Across 3 benchmark workloads, AWS RDS PostgreSQL (pgvector) prices lower in 3 of 3 — by up to ~92% at parity scenarios. It uses fixed-capacity plans, so steady workloads amortize the floor. Both are compared on identical USD-normalized footprints; verify current rates via each row's provenance date in the full tool.

Monthly Cost Across Realistic Benchmarks

RAG Prototype · 100k×1536 fp32
AWS RDS PostgreSQL (pgvector): $28.00/mo AWS OpenSearch Serverless: $350.42/mo
Cheaper: AWS RDS PostgreSQL (pgvector)
Mid Scale · 1M×768 INT8
AWS RDS PostgreSQL (pgvector): $28.00/mo AWS OpenSearch Serverless: $350.43/mo
Cheaper: AWS RDS PostgreSQL (pgvector)
Large · 5M×768 INT8 10M queries
AWS RDS PostgreSQL (pgvector): $28.00/mo AWS OpenSearch Serverless: $350.57/mo
Cheaper: AWS RDS PostgreSQL (pgvector)