AI & LLM Index
Glossary · Retrieval and RAG

What is Hybrid search?

Hybrid search is a retrieval or retrieval-augmented generation concept. It is part of the vocabulary teams use when they compare models, design prompts or review an AI system.

Definition

Hybrid search is a retrieval or retrieval-augmented generation concept. It is part of the vocabulary teams use when they compare models, design prompts or review an AI system. The term is used in retrieval and rag discussions, where precision matters: two teams can use the same word to mean slightly different things. In this glossary, hybrid search is treated as a practical concept rather than a formal specification.

Why it matters

Retrieval terms describe how external documents are indexed, searched and inserted into a prompt. They matter because most production systems rely on fresh or private data that is not in the model's weights.

Example

Suppose you are comparing QwQ Instruct with another model for a production task. Hybrid search is one of the factors behind the numbers you see: QwQ Instruct lists a 65,536-token context window, costs $4.62 per million input tokens and scores 88.4 on HellaSwag. Understanding the term helps you decide which of those differences actually matter for your workload.

How to evaluate it

  • Check whether hybrid search is defined the same way in the documentation you are reading.
  • Ask which measurement or trade-off the term is describing before comparing numbers.
  • Separate vendor claims from independently observed behaviour on your own data.
  • Write down the definition your team uses so reviews and evaluations stay consistent.

Related terms

Retrieval-augmented generationRetrieval and RAG RAGRetrieval and RAG EmbeddingRetrieval and RAG Vector databaseRetrieval and RAG Semantic searchRetrieval and RAG BM25Retrieval and RAG

Related guides

How to choose an LLM for legal researchBuying How to choose an LLM for research synthesisBuying How to choose an LLM for searchBuying How to choose an LLM for market researchBuying

FAQ

What does Hybrid search mean?

Hybrid search is a retrieval or retrieval-augmented generation concept. It is part of the vocabulary teams use when they compare models, design prompts or review an AI system.

Why does Hybrid search matter?

Retrieval terms describe how external documents are indexed, searched and inserted into a prompt. They matter because most production systems rely on fresh or private data that is not in the model's weights.

How is Hybrid search used in practice?

Suppose you are comparing QwQ Instruct with another model for a production task. Hybrid search is one of the factors behind the numbers you see: QwQ Instruct lists a 65,536-token context window, costs $4.62 per million input tokens and scores 88.4 on HellaSwag. Understanding the term helps you decide which of those differences actually matter for your workload.