Build vs Buy a RAG Layer in 2026: real TCO, vendor playbook, and SLA traps
If your legal team requires auditable vectors, don't DIY without a three-year TCO model — off-the-shelf vector stores plus managed LLMs usually win for mid-market. This post gives an apples-to-apples cost model, vendor tradeoffs (Pinecone, Weaviate, Milvus), managed LLM SLA realities (OpenAI, Anthropic, Vertex), and the contract clauses that cause the bills to spike.
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