The T4 Stack extends the T3 Stack (Next.js, TypeScript, tRPC, Tailwind) with an AI layer: Next.js 16, Vercel AI SDK, and local RAG using embeddings and vector search. This tutorial demonstrates building a production-ready AI chat system with local embedding models, SQLite-based vector storage, streaming responses, and context
Table of contents
Table of ContentsThe T3 Stack Changed Everything — Now It Needs an UpgradeWhat's New in Next.js 16 That Matters for AIThe Vercel AI SDK: The Backbone of the T4 StackContext Engineering > Prompt EngineeringBuilding Local RAG: Embeddings + Vector Search Without External APIsWiring It All Together: The Full T4 RAG ChatMaking It "Senior": Production PatternsPerformance and Cost ComparisonWhat's Next for the T4 StackThis Is the Stack Senior Engineers Are ShippingSort: