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Modèles tarifaires

Spot vs réservé vs à la demande

Adaptez chaque modèle tarifaire à l'interruptibilité et à la stabilité de votre charge.

Résumé Exécutif et Réponse Rapide

Tous les grands fournisseurs vendent le même calcul selon trois prismes tarifaires : flexibilité à la demande, enchères spot/preemptibles et engagements réservés. Se tromper de prisme est l'une des erreurs de facturation cloud les plus courantes.

Révisé

2026-08-22

On-demand: the default you pay a premium for

On-demand is billed per second or hour with zero commitment. It is the right price for spiky, stateful, or hard-to-replicate workloads, and the wrong price for anything that runs 24/7 for months.

Spot: 60-90% off with an eviction notice

Spot instances are excess capacity sold at deep discounts with a short termination warning (30 seconds to 2 minutes depending on provider). They shine for batch jobs, CI runners, rendering, and fault-tolerant worker pools that checkpoint state externally.

Reserved and savings plans: commit to save

One-year and three-year commitments discount steady-state compute substantially on hyperscalers. Commit only after usage has been stable for several months, and prefer convertible terms if your instance mix may change.

A simple decision rule

Runs occasionally or must never be interrupted: on-demand. Interruptible and parallelizable: spot. Runs 24/7 with predictable size: reserved. Re-run this analysis every quarter as workloads change.

À retenir

  • Spot discounts range from 60% to 90% across AWS, Azure, GCP, and Alibaba.
  • Reserved commitments reward predictable steady-state workloads.
  • Match the pricing model to workload interruptibility, not to habit.

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