Is retrieval the right architecture? RAG vs long context vs fine-tuning, what it costs to run, and when not to use it at all.https://what-is-rag.org/https://what-is-rag.org/blogs/latency-budgets-for-retrieval/https://what-is-rag.org/blogs/latency-budgets-for-retrieval/Where the milliseconds go in a RAG request, which stages you can cut when your target is under two seconds, and what each cut costs you.Sun, 26 Jul 2026 00:00:00 GMTlatencyarchitecturetradeoffshttps://what-is-rag.org/blogs/rag-versus-fine-tuning-as-an-architecture-decision/https://what-is-rag.org/blogs/rag-versus-fine-tuning-as-an-architecture-decision/Not which is more accurate — which one leaves you able to fix a wrong answer on a Tuesday afternoon. An ownership-first comparison.Sat, 25 Jul 2026 00:00:00 GMTarchitecturedecisionstradeoffshttps://what-is-rag.org/blogs/what-a-rag-system-actually-costs-to-run/https://what-is-rag.org/blogs/what-a-rag-system-actually-costs-to-run/The full line-item breakdown: embedding, storage, inference, reindexing — plus the two costs nobody budgets and one that dominates everything.Sat, 25 Jul 2026 00:00:00 GMTcostarchitecturehttps://what-is-rag.org/blogs/rag-versus-long-context-the-cost-arithmetic/https://what-is-rag.org/blogs/rag-versus-long-context-the-cost-arithmetic/Both architectures work. They have different cost curves, and the crossover depends on three variables you can estimate this afternoon.Fri, 24 Jul 2026 00:00:00 GMTcostarchitecturetradeoffshttps://what-is-rag.org/blogs/when-not-to-use-rag/https://what-is-rag.org/blogs/when-not-to-use-rag/Four situations where retrieval is the wrong shape for the problem, what to build instead, and the threshold at which each answer flips.Fri, 24 Jul 2026 00:00:00 GMTarchitecturedecisions