Nvidia releases Nemotron 3.5 Lightning and open-source NeMo Switchyard for agent routing

Nvidia has introduced Nemotron 3.5 Lightning, a 30 billion-parameter open mixture-of-experts model aimed at high-volume agent workloads, alongside NeMo Switchyard, an open-source library that routes steps in an agent workflow across different models. Nvidia says Lightning delivers faster output than comparable models and that, when paired with Switchyard, the setup can maintain strong task performance while reducing benchmark costs versus relying on a frontier model alone.