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How It Works
AWS offers two main types of Reserved Instances: Standard and Convertible. Standard Reserved Instances lock you into a specific instance configuration for 1 or 3 years. Convertible Reserved Instances, the flexible variant, allow you to exchange your commitment for a different instance family, size, operating system, or tenancy at any point during the term, as long as the new commitment is of equal or greater value. This exchange capability is what makes them “flexible.” The tradeoff is a lower maximum discount compared to Standard Reserved Instances, which offer up to 72% off on-demand pricing. AWS also offers Compute Savings Plans, which provide similar flexibility automatically without requiring manual exchanges.
Why It Matters for Cloud Cost
Engineering teams that need flexibility tend to avoid Reserved Instances entirely because they fear being locked into the wrong configuration. Flexible Reserved Instances address that directly by letting you adjust as your workload evolves. A team that commits to one instance type today and migrates to a newer generation next quarter is not penalized. The result is that you can pursue commitment-based discounts without betting on infrastructure decisions staying fixed for years. Without this flexibility, teams either accept rigid commitments and eat the cost of mismatches or avoid commitments altogether and pay full on-demand rates.
Usage AI’s Autopilot purchases and adjusts commitments daily across AWS without human approval, removing the need to manually manage commitment types or exchanges.