The Hidden Costs of Building Your Own RAG Stack — Ofer Vectara
Feb 22, 2025 · 15:14
Ofer from Vectara argues that building your own RAG stack comes with seven hidden costs: irrelevant responses and hallucinations, high latency, scaling and cost issues, security and compliance challenges, vendor chaos from multiple components, unsustainable expertise requirements, and limited non-English language support. He details how each pitfall compounds at enterprise scale, citing the need for hybrid search, reranking, and continuous evaluation to maintain quality. Vectara offers a turnkey RAG-as-a-service platform that handles parsing, chunking, embedding, vector search, retrieval, and hallucination detection. Ofer highlights Vectara’s open-source HHEM model for hallucination evaluation, downloaded over 3 million times, and a leaderboard showing some LLMs hallucinate at rates above 10%. The platform supports deployment in SaaS, VPC, or on-premises, with built-in access control and explainability.
