OFICIAL AWS What's New

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

What happened
Based on AWS What's New · Aug 25, 2026

AWS Lambda has launched managed runtimes for Node.js 26 and Python 3.15 in public preview, allowing users to test upcoming versions before general availability and provide feedback.

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AWS Lambda introduces managed runtimes in public preview for Node.js 26 and Python 3.15
AWS What's New — Amazon Web Services
Key points
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Today, AWS Lambda presents managed runtimes in public preview, starting with Node.js 26 and Python 3.15.
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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.
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Previously, Lambda managed runtimes the company is launched directly as GA releases.
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Since the runtimes could immediately be used by production workloads, the Lambda team couldn’t make changes post-GA that might impact existing functions.
Key numbers
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x or python3.

AWS Lambda has introduced managed runtimes for Node.js 26 and Python 3.15 in public preview, enabling customers, partners, and language communities to evaluate upcoming versions before their general availability release. This initiative allows users to test workloads and report issues while changes are still possible, unlike previous direct GA launches. The preview period provides an opportunity to identify and address potential problems before the runtime becomes widely available. Third-party tools and frameworks can also validate compatibility during this phase.

Managed runtimes in public preview are not covered by the Lambda SLA or AWS Technical Support plans and should not be used for production workloads due to the possibility of breaking changes. The runtime identifiers for preview versions match those of the eventual GA releases, ensuring automatic graduation to GA without requiring modifications to functions. Users can select the preview runtimes from the Lambda console or specify them via AWS CLI, CloudFormation, AWS SAM, or AWS CDK using the identifiers nodejs26.x or python3.15.

The Node.js 26 and Python 3.15 managed runtimes in public preview are available across all AWS commercial Regions, AWS GovCloud (US) Regions, and China Regions. There is no additional cost for using these preview runtimes; functions are billed at standard Lambda rates. This approach aims to gather early feedback and refine the runtimes before their official release.

To learn more about the managed runtimes in public preview, users can refer to the AWS blog post for additional details. Feedback can be shared through dedicated GitHub issues for Node.js 26 and Python 3.15, helping AWS improve the runtimes before their general availability.

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