# Using Exact-Match Response Caching to Reduce LLM Costs

DevFeed: [Using Exact-Match Response Caching to Reduce LLM Costs](<https://devfeed.tech/articles/why-an-old-caching-trick-is-your-secret-to-lower-llm-costs-17399.md>)

Original publisher: [Read original article](<https://thenewstack.io/llm-response-caching-costs/>)

Author: Abhilash Rao Mesala

Published: 2026-09-14T11:00:00Z

Content type: article

Language: en

Sources: [The New Stack](<https://devfeed.tech/sources/the-new-stack.md>)

Topics: [Caching](<https://devfeed.tech/topics/caching.md>), [Large Language Model](<https://devfeed.tech/topics/llm.md>)

Tags: [ai-engineering](<https://devfeed.tech/tags/ai-engineering.md>), [ai-infrastructure](<https://devfeed.tech/tags/ai-infrastructure.md>), [caching](<https://devfeed.tech/tags/caching.md>), [contributed](<https://devfeed.tech/tags/contributed.md>), [cost](<https://devfeed.tech/tags/cost.md>), [finops](<https://devfeed.tech/tags/finops.md>), [generation](<https://devfeed.tech/tags/generation.md>), [hash](<https://devfeed.tech/tags/hash.md>), [llm](<https://devfeed.tech/tags/llm.md>), [token](<https://devfeed.tech/tags/token.md>)

## AI overview

The article explains how to reduce LLM costs by fingerprinting requests, context, model settings, and underlying data to create exact-match cache keys. Valid cached responses can be reused without calling the model. It distinguishes response caching from provider prompt caching, where only eligible prompt computation is reused.

## Source excerpt

An LLM can answer the same question a thousand times and charge you each time. Before paying for another answer, The post Why an old caching trick is your secret to lower LLM costs appeared first on The New Stack.