Pinecone made its Nexus knowledge engine generally available on August 6, 2026, pitching it as the layer that sits between an enterprise’s proprietary data and the AI agents consuming it — and releasing benchmark results and internal production numbers to argue the layer, not the model, is where agent performance is won. The product, which entered public preview five weeks earlier, compiles a company’s documents and workflows into a governed, pre-structured knowledge layer that agents query in…