Semantic Caching for LLM Apps 2026: GPTCache & Redis Tested
Semantic caching LLM traffic cuts costs and p95 latency fast. We tested GPTCache and Redis in production for 2026 — real benchmarks, hit rates, and setup...
Chapter 1: Why Semantic Caching Matters in 2026: The Economics of Repeated Prompts Every production LLM app eventually discovers the same uncomfortable truth: your users are not as creative as you assumed. They ask the same twenty questions in forty different ways. "How do I reset my password?" arrives as "password reset help," "can't log in, forgot pw," and "I need to change my password please." To your application, these are three distinct strings. To your wallet, they are three distinct invoices. To your p95 latency chart, they are three distinct spikes. This chapter makes the economic case for semantic...