Flex Reservations and Spot Explained | CoreWeave Blog

This post introduces and explains CoreWeave's Spot and Flex Reservations capacity models. Flex Reservations separate guaranteed access from 24/7 run-rate pricing by offering a lower holding fee for reserved capacity and a usage rate only when nodes are actively in use. Spot instances are presented as lower-cost, interruptible compute with explicit termination signaling and a defined preemption notice window to allow for checkpointing. The post also highlights CoreWeave ARENA as a platform for testing Spot instances and mentions Weights and Biases Inference for production inference workflows.