What is the primary benefit of using prompt caching in the Claude API?
Select an answer to reveal the explanation.
Short Explanation
Prompt caching lets you pay full price once for a long prompt prefix, then reuse it for big discounts and faster responses on cache hits. It’s like pre-loading a long document into memory once and reading it for free for every question.
Full Explanation
Claude's prompt caching feature lets developers cache frequently used prompt prefixes, such as a long system prompt, a large document, or a big code file. After the first call that creates the cache, subsequent calls that use the same prefix get a significant discount on input token pricing and reduced latency. Cache entries last for a defined period, such as 5 minutes, and can be extendable. The option about remembering conversations across different users is wrong because caching is per-prefix for cost and performance, not cross-user memory. The option about storing Claude's responses for serving to users without calling the API again describes response caching at the application layer, which is a different concept. The option about compressing the system prompt to fit more content into the context window is wrong because caching doesn't compress content.