OpenAIGuides & TipsOfficial Docs
OpenAI guide: structure prompts for caching wins
Cuts latency and cost for repetitive, instruction-heavy flows.
Key Points
- 1Cache relies on exact prefix matches
- 2Place static content first, variable content last
- 3prompt_cache_key can improve hit rates
OpenAI’s Prompt Caching guide recommends putting static instructions/examples first and variable user data last. Cache hits depend on exact prefix matches, so ordering can make or break the benefit. Repetitive workloads can see faster responses and lower costs.