Response Caching With Semantic Deduplication

via “request-response-caching-with-semantic-matching”

Unified API for 100+ LLM providers — OpenAI format, load balancing, spend tracking, proxy server.

Unique: Implements a dual-mode caching system: (1) exact-match via SHA256 hash of request (messages + model + parameters), (2) semantic matching via embedding similarity search in Redis. The semantic cache stores embeddings of past prompts and retrieves cached responses for queries with cosine similarity > threshold (default 0.95). Dynamic cache controls allow per-request overrides (e.g., cache=false, ttl=3600) without code changes.

vs others: Semantic caching is unique vs OpenAI's simple response caching (which only does exact-match); more flexible than Anthropic's prompt caching (which requires explicit cache_control markers); Redis-based allows distributed caching across multiple instances