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

AWS Lambda Managed Runtimes in Public Preview

AWS Lambda introduces managed runtimes in public preview, starting with Node.js 26 and Python 3.15. This allows customers and partners to test upcoming runtimes before their general availability (GA) release.

Managed runtimes in public preview provide an opportunity to test workloads and report issues before GA. However, these runtimes are not covered by the Lambda SLA or AWS Technical Support plans and should not be used for production workloads.

What to do

• Select "Node.js 26 (Preview)" or "Python 3.15 (Preview)" from the runtime dropdown in the Lambda console.
• Specify nodejs26.x or python3.15 as the runtime identifier in the AWS CLI, CloudFormation, AWS SAM, or AWS CDK.

Managed runtimes in public preview are available in all AWS commercial Regions, AWS GovCloud (US) Regions, and China Regions. There is no additional cost—functions using preview runtimes are billed at standard Lambda rates.

Source: AWS release notes

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