OpenAIGuides & TipsOfficial Docs
OpenAI Details How to Use Prompt Caching Effectively
Repeat instructions faster and cheaper with effective prompt caching.
Key Points
- 1Exact prefix match is required for cache hits
- 2Place fixed instructions/examples at the prompt start
- 3Effectiveness depends on prompt structure
OpenAI's guide explains how to maximize Prompt Caching benefits by structuring prompts with fixed prefix parts (instructions or examples) to improve cache hits, reducing latency and cost. This technique is most effective for applications like chatbots sending repeated preambles. Frequent reformatting can reduce its effectiveness due to the exact match requirement.