Prompt caching for LLM APIs: 6 reasons your cache never hits
Originally published on Extenify . Prompt caching can make the repeated part of an LLM prompt up to 90% cheaper on OpenAI, Claude and Gemini, but a lot of backends turn it on and then never get a single cache hit. The bill looks normal, cached_tokens sits at 0, and nobody notices. Here is how the c…
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- 2026-11-08 09:15 · DEV Community — AI
Prompt caching for LLM APIs: 6 reasons your cache never hits