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What are the key differences between spot and reserved instances in cloud platforms?

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What are the key differences between spot and reserved instances in cloud platforms?

Asked on Mar 30, 2026

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Spot and reserved instances are two distinct pricing models offered by cloud platforms to optimize cost management for different workload types. Spot instances are ideal for flexible, non-critical workloads due to their variable pricing and availability, while reserved instances offer cost savings for predictable, long-term workloads with a commitment to usage.

Example Concept: Spot instances allow users to bid on unused cloud capacity at lower prices, making them suitable for batch processing, data analysis, and other interruptible tasks. They can be terminated by the cloud provider with little notice. In contrast, reserved instances require a commitment (typically 1 to 3 years) and provide significant discounts over on-demand pricing, making them ideal for steady-state applications and predictable workloads.

Additional Comment:

Spot instances can be up to 90% cheaper than on-demand instances, but they come with the risk of sudden termination.
Reserved instances offer up to 75% cost savings compared to on-demand pricing, with the trade-off of a long-term commitment.
Spot instances are best for workloads that can tolerate interruptions, such as testing or development environments.
Reserved instances are suitable for applications with consistent usage patterns, such as web servers or databases.
Both options contribute to cost optimization strategies within the Well-Architected Framework.

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What are the key differences between spot and reserved instances in cloud platforms?

Asked on Mar 30, 2026

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