vLLM Ships Decision 3.0: New Open Decision Models via Semantic Router

vLLM has released Decision 3.0, a new generation of open decision models integrated with its semantic router, targeting intelligent request routing in LLM serving infrastructure. Decision models in this context are lightweight models trained to classify and route incoming prompts to the appropriate downstream model or pipeline based on semantic content, rather than rule-based heuristics. This is a significant developer tooling advancement for anyone running multi-model serving stacks, as it enables dynamic, learned routing without hand-crafted rules. The open nature of the release means teams can fine-tune routing behavior on their own traffic distributions. For engineers managing inference infrastructure at scale, this directly reduces cost and latency by ensuring prompts hit the right model on the first call.