---
title: "How does DeepSeek API prompt caching handle repeated prefixes?"  
description: "How does DeepSeek API prompt caching handle repeated prefixes?"  
author: "Ruslan Galiev"  
published: 2026-10-26  
updated: 2026-10-26  
canonical: https://www.mindstick.com/forum/162941/how-does-deepseek-api-prompt-caching-handle-repeated-prefixes  
category: "DeepSeek API"  
tags: ["DeepSeek", "api(s)", "Prompt Caching", "developers"]  
reading_time: 1 minute  

---

# How does DeepSeek API prompt caching handle repeated prefixes?

I send several requests to the DeepSeek API with the same long system prompt and shared reference material, followed by a different user question each time. I’m wondering how reliably the API can reuse that repeated prefix rather than process it from scratch.

For anyone who has tested **DeepSeek API prompt caching**, does the shared text need to match exactly, and is there a way to tell from usage data when a cache hit occurred? I’d like to know what to measure before changing how I structure requests.


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Original Source: https://www.mindstick.com/forum/162941/how-does-deepseek-api-prompt-caching-handle-repeated-prefixes

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