A company runs thousands of stateless, fault-tolerant simulations that run up to 3 hours each on AWS Batch. Which EC2 pricing model best reduces cost while meeting these requirements?

Spot Instances are the most cost-effective option for fault-tolerant, stateless workloads like simulations. They allow you to bid on unused EC2 capacity, offering significant discounts compared to On-Demand prices. Since the simulations are stateless and fault-tolerant, they can be interrupted and resumed without data loss, making them ideal for Spot Instances. Reserved Instances are for steady-state, predictable workloads over a 1-3 year term, which doesn't fit the intermittent nature of simulations. On-Demand Instances are more expensive and offer no cost savings for interruptible workloads. Dedicated Instances provide physical isolation and are the most expensive, offering no benefit for this use case.