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Dev.to
5/9/2026
Small-to-Big RAG: Your AI Needs a Better Context 🧠

Small-to-Big RAG: Your AI Needs a Better Context 🧠

Short summary

Small-to-Big RAG improves retrieval by searching small, precise snippets but returning large context blocks to the LLM. Use Sentence Window for unstructured narrative text (grab surrounding sentences); use Parent Document Retrieval for structured docs where sections matter. Choose based on data type: Sentence Window for simple Q&A, Parent Document for enterprise systems.

  • Small-to-Big RAG searches precise snippets but returns rich context for better LLM understanding
  • Sentence Window grabs nearby sentences for narrative text; Parent Document fetches entire sections for structured docs
  • Choose Sentence Window for Q&A with unstructured data; choose Parent Document for enterprise systems with document boundaries

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