OpenAI Prompt Cache Rate Limiting

This post introduces a critical, often overlooked, limitation of OpenAI's prompt caching mechanism: a rate limit of approximately 15 requests per second. For applications operating at scale, this necessitates custom engineering solutions to manage cache hits and misses effectively, ensuring cost savings and performance benefits are realized beyond this inherent ceiling. The discussion highlights the need for developers to implement their own strategies for handling higher request volumes when relying on prompt caching.