# How LLMs Can Find a Needle in a Haystack

DevFeed: [How LLMs Can Find a Needle in a Haystack](<https://devfeed.tech/articles/how-llms-can-find-a-needle-in-a-haystack-31466.md>)

Original publisher: [Read original article](<https://blog.bytebytego.com/p/how-llms-can-find-a-needle-in-a-haystack>)

Author: ByteByteGo

Published: 2026-09-16T15:31:42Z

Content type: tutorial

Language: en

Sources: [ByteByteGo](<https://devfeed.tech/sources/bytebytego.md>)

Topics: [Large Language Model](<https://devfeed.tech/topics/llm.md>), [Language models](<https://devfeed.tech/topics/language-models.md>), [App](<https://devfeed.tech/topics/app.md>)

Tags: [article](<https://devfeed.tech/tags/article.md>), [llm](<https://devfeed.tech/tags/llm.md>), [llm-applications](<https://devfeed.tech/tags/llm-applications.md>), [llms](<https://devfeed.tech/tags/llms.md>)

## AI overview

This tutorial explains the retrieval problem in LLM applications: finding current, relevant evidence in large collections of private documents. It discusses embeddings, semantic matching, search scope, and changing answers.

## Source excerpt

In this article, we are going to look at how LLMs can find a needle in a haystack.