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On a 40-account AWS Organization, platform baseline via CloudFormation StackSets (Hooks, GuardDuty enroll) plus app teams on Terraform/OpenTofu cut org-wide guardrail rollout from 9 weeks to 3 — without forcing one tool for everything.
June 2026 benchmark on the same read-only AWS scaffold: OpenTofu 1.12 plan median 5.2s vs Pulumi 3.248 preview median 10.6s—plus when to pick HCL over TypeScript on landing zones.
May 2026 guidance with a reproducible scaffold—9 artefact files, 0 Terraform-managed creates at plan baseline, anchored to official OpenTofu, HashiCorp, and Ansible project documentation.
Terraform to OpenTofu migration: compatibility, risks, tools, and production deployment patterns for AWS infrastructure.