The three pricing models available for Oracle Cloud Infrastructure are:

1. Pay-As-You-Go (PAYG): This model allows you to pay for resources and services on an hourly or monthly basis, depending on your usage. It provides flexibility to scale resources up or down as needed without long-term commitments.
2. Monthly Flex: With this model, you commit to a certain amount of usage in advance for a fixed monthly fee. This can offer cost savings compared to PAYG pricing, especially for consistent workloads.
3. Bring Your Own License (BYOL): This model allows you to use your existing Oracle software licenses on Oracle Cloud Infrastructure, potentially reducing the cost of running Oracle software on the cloud.