How do I choose the right instance type?

Picking an instance comes down to three things: GPU memory for your model, regional availability, and capacity commitment.

GPU memory. Estimate the memory your model needs using the precision-based formulas (FP16, INT8, INT4) and the training overhead multiplier documented in Selecting an instance, then pick an instance whose aggregate GPU memory exceeds that.
Regional availability. Not every instance is in every Availability Zone. Check the Instance Availability Matrix to confirm your target instance is in your target region.
Capacity plan. Reserved Instances, Flex Reservations, On-Demand, and Spot trade cost for guarantees in different ways. See Capacity plans.

Contact CoreWeave support for help sizing your GPU requirements, finding capacity in a specific region, or choosing between capacity plans.