Compare AWS, Azure, Google Cloud (GCP), and Oracle Cloud Infrastructure (OCI) across 100+ services in 2026. Each entry includes SLA uptime guarantees, FedRAMP compliance status, pricing signals, and real-world notes for architects and engineers making multi-cloud decisions.
Service Categories Covered
Compute & Virtual Machines — EC2 vs Azure VMs vs GCP Compute Engine vs OCI Compute. SLA: 99.5% (single-instance, Azure/OCI), 99.95% (multi-zone, all providers).
Object Storage — S3 vs Azure Blob Storage vs Google Cloud Storage vs OCI Object Storage. All offer 99.9% SLA and tiered pricing.
Managed Kubernetes — EKS vs AKS vs GKE vs OKE. All offer 99.95% SLA for the control plane.
Managed PostgreSQL — RDS/Aurora PostgreSQL vs Azure Database for PostgreSQL vs Cloud SQL vs OCI Database Service. FedRAMP High: AWS (GovCloud), Azure (Government).
Serverless Functions — AWS Lambda vs Azure Functions vs Cloud Functions vs OCI Functions.
Pub/Sub & Messaging — SNS/SQS vs Azure Service Bus vs Cloud Pub/Sub vs OCI Streaming. FedRAMP High: AWS SNS (GovCloud), Azure Service Bus (Government). FCM is not FedRAMP authorized.
CDN & Edge — CloudFront vs Azure CDN vs Cloud CDN vs OCI CDN.
Data Transfer & Migration — AWS DataSync (FedRAMP High) vs Azure Data Factory (FedRAMP High) vs GCP Storage Transfer (FedRAMP Moderate) vs OCI Data Transfer (FedRAMP Moderate).
AI & Machine Learning — SageMaker vs Azure ML vs Vertex AI vs OCI Data Science.
Identity & Access Management — IAM vs Azure Active Directory vs Cloud IAM vs OCI IAM.
FedRAMP Compliance Summary (2026)
FedRAMP (Federal Risk and Authorization Management Program) is required for US government cloud workloads. Here is how the four major providers compare:
AWS GovCloud (US) — FedRAMP High across most core services (EC2, S3, RDS, SNS, Lambda, etc.).
Azure Government — FedRAMP High across core services (VMs, Blob, SQL, Notification Hubs, etc.).
Google Cloud Assured Workloads — FedRAMP Moderate for most services including Cloud SQL and Cloud Pub/Sub. Firebase Cloud Messaging (FCM) is NOT FedRAMP authorized.
Oracle Cloud Infrastructure (OCI) — FedRAMP Moderate for core services including Compute, Object Storage, Autonomous DB, and OCI Notifications.
SLA Comparison at a Glance
Deployment Type
AWS
Azure
GCP
OCI
Single-instance VM
No SLA
99.5%
No SLA
99.5%
Multi-zone VM
99.95%
99.95%
99.95%
99.95%
Multi-region active-active
99.99%+
99.99%+
99.99%+
99.99%+
Object Storage
99.9%
99.9%
99.9%
99.9%
Managed Kubernetes
99.95%
99.95%
99.95%
99.95%
Frequently Asked Questions
What are the SLA differences between AWS, Azure, GCP, and Oracle Cloud in 2026?
In 2026, cloud provider SLAs vary by deployment configuration. For single-instance VMs: AWS EC2 offers no SLA, Azure VMs guarantee 99.5%, GCP Compute Engine offers no single-instance SLA, and OCI Compute offers 99.5%. For multi-zone deployments, all four providers guarantee 99.95%.
Is Firebase Cloud Messaging (FCM) FedRAMP authorized in 2026?
No. FCM has not received FedRAMP authorization at any impact level. Federal agencies requiring compliant push messaging must use AWS SNS (FedRAMP High, GovCloud) or Azure Notification Hubs (FedRAMP High, Government). Google Cloud Pub/Sub is FedRAMP Moderate via Assured Workloads.
How do data transfer tools compare across cloud providers?
AWS DataSync (FedRAMP High) is the most mature online transfer tool. Azure Data Factory Copy Activity (FedRAMP High) offers the widest source/sink ecosystem (90+ connectors). GCP Storage Transfer Service is FedRAMP Moderate. OCI Data Transfer Service covers both online and physical appliance workflows.
Which provider has the lowest egress pricing?
Oracle Cloud (OCI) includes 10 TB free egress per month, then $0.0085/GB — roughly 10× cheaper than AWS (~$0.09/GB), Azure (~$0.087/GB), or GCP (~$0.08/GB).