semantic-router alternatives
Curated alternatives to semantic-router — and why you'd switch.
router
Weave's Go model router: drop-in proxy speaking Anthropic, OpenAI and Gemini APIs that scores each request with an on-box ONNX embedder (Avengers-Pro clusters) and routes to the cheapest fit model.
Why switchBoth are drop-in model routers that classify each request and send it to the best-fit model; Weave's is a single Go proxy with an on-box embedder, vLLM SR a policy-programmable cluster-scale layer.
Full comparison →plano
AI-native Envoy-based proxy for agentic apps: agent orchestration via a 4B routing model, smart LLM routing, guardrail filter chains and zero-code OTEL traces. Rust, framework-agnostic.
Why switchBoth sit between agents and models with learned routing and guardrail chains; plano is an Envoy-based proxy with a 4B routing model, SR a vLLM-native decision layer with its own routing models.
Full comparison →LLMRouter
UIUC's LLM routing library: 16+ trainable routers (KNN, MLP, matrix factorisation, Elo, graph, BERT) pick the best model per query, with xRouteBench and a train/serve CLI.
Why switchSame job — pick the best model per query; llmrouter is a research library of trainable routers, SR a production gateway built around that decision.
Full comparison →