AWS Lambda introduces managed runtimes in public preview for Node.js 26 and Python 3.15

Today, AWS Lambda introduces managed runtimes in public preview, starting with Node.js 26 and Python 3.15. This gives customers, partners and upstream language communities the opportunity to try upcoming managed runtimes before their general availability (GA) release and to share their feedback with the Lambda team. Previously, Lambda managed runtimes were launched directly as GA releases.