{"id":23,"date":"2025-06-02T11:00:00","date_gmt":"2025-06-02T11:00:00","guid":{"rendered":"https:\/\/unstale-test.pbnos.fr\/?p=23"},"modified":"2025-06-02T11:00:00","modified_gmt":"2025-06-02T11:00:00","slug":"prompt-caching-explained-when-it-actually-saves-money","status":"publish","type":"post","link":"https:\/\/unstale-test.pbnos.fr\/?p=23","title":{"rendered":"Prompt Caching Explained: When It Actually Saves Money"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Prompt caching lets a provider reuse the computed state of a prompt prefix across requests, and bill that reused portion at a fraction of the normal input price. It is the single easiest discount most API users never claim.<\/p>\n<h2 class=\"wp-block-heading\">When caching pays off<\/h2>\n<p class=\"wp-block-paragraph\">Caching shines when many requests share a long, stable prefix: a system prompt with detailed instructions, a fixed set of few-shot examples, or a document being questioned repeatedly. The savings scale with prefix length and request frequency.<\/p>\n<h2 class=\"wp-block-heading\">When it does not<\/h2>\n<p class=\"wp-block-paragraph\">Cache entries expire after minutes of inactivity, so low-traffic applications rarely hit the cache. And if your prompt prefix changes on every call, for example because you inject a timestamp at the top, you break the cache without noticing. Put volatile data at the end of the prompt, keep the stable part first, and check your provider&#8217;s usage dashboard to confirm the cached tokens actually show up.<\/p>","protected":false},"excerpt":{"rendered":"<p>Prompt caching lets a provider reuse the computed state of a prompt prefix across requests, and bill that reused portion at a fraction of the normal input price. It is the single easiest discount most API users never claim. When caching pays off Caching shines when many requests share a long, stable prefix: a system [&hellip;]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-23","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/unstale-test.pbnos.fr\/index.php?rest_route=\/wp\/v2\/posts\/23","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unstale-test.pbnos.fr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unstale-test.pbnos.fr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/unstale-test.pbnos.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=23"}],"version-history":[{"count":0,"href":"https:\/\/unstale-test.pbnos.fr\/index.php?rest_route=\/wp\/v2\/posts\/23\/revisions"}],"wp:attachment":[{"href":"https:\/\/unstale-test.pbnos.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=23"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unstale-test.pbnos.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=23"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unstale-test.pbnos.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=23"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}