Semantic Routing

A superfast decision layer for LLMs and AI agents: it routes requests based on semantic meaning, not slow, unreliable keyword matching.

Semantic Routing is a core AI architecture component: it directs user inputs to the correct predefined action or LLM based on vector embeddings and semantic similarity. This approach bypasses the typical latency of full LLM inference for tool-use decisions, cutting average decision time from 5,000ms to a sharp 100ms (a 50x speedup). By converting a query like "How do I change my password?" into a vector, the system deterministically routes it to the correct pipeline (e.g., Technical Support) or guardrail (e.g., Content Moderation). This enables faster, safer, and more scalable AI systems, supporting the dynamic use of thousands of tools without the context window overhead.

https://aurelio.ai/semantic-router