Cut Your LLM Costs by 90% With Prompt Caching (And Why Most Developers Don't)
Prompt caching, also known as prefix caching, can significantly reduce LLM operational costs by avoiding redundant processing of static prompt elements. This technique functions similarly to HTTP caching, where a hash of the prompt's initial, unchanging section is stored. Subsequent requests that match this prefix only incur costs for processing new tokens, potentially cutting expenses by up to 90%. However, developers often fail to achieve high cache hit rates because dynamic elements like timestamps, unordered lists, or user-specific data are incorrectly included in the static prefix, leading to cache invalidation. AI
IMPACT Optimizing LLM prompt caching can drastically reduce operational expenses for AI applications by avoiding redundant computations on static content.