AWS Announces Major Serverless Feature Updates

AWS announces a slate of serverless releases and feature updates at re:Invent 2025 in Q4 2025, including Lambda durable functions, Lambda Managed Instances, tenant isolation mode, expanded runtimes, and ECS Express Mode. The launches (announced Dec 2025 at re:Invent) enable long-running stateful workflows, EC2-backed managed compute, improved container image signing, and streaming API responses. Developers can adopt these to build reliable AI workflows, reduce costs, and simplify deployments.