CoreWeave RL rollouts reload model weights 15× faster with Dynamo

CoreWeave's new RL rollouts service uses ModelExpress and Router in NVIDIA Dynamo to speed up model weight reloads during RL post-training with minimal downtime.

Working with NVIDIA and You.com, CoreWeave achieved 15× faster model reloads than its baseline while post-training Nemotron 3.5 Lightning. The speedup addresses GPUs sitting idle while inference workers wait to load updated weights between training iterations.