Top Vector Databases for AI Agents in 2026: Qdrant vs Pinecone vs Weaviate vs PgVector vs Milvus

In 2026, selecting vector databases for AI agents focuses on payload metadata filtering, hybrid search combining BM25 and dense vectors, and multi-tenancy memory namespacing to enable persistent memory for LLMs. Simultaneously, Next.js hosting costs are analyzed across Vercel, Netlify, Railway, and VPS for mid-traffic sites. The evaluation considers a site with 80k page views, 4GB egress, and 300k image transforms using Next.js 15 App Router and Sanity CMS to provide realistic production pricing.