Open Neural Network Exchange

The open standard for machine learning interoperability

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ONNX is an open format built to represent machine learning models. ONNX defines a common set of operators - the building blocks of machine learning and deep learning models - and a common file format to enable AI developers to use models with a variety of frameworks, tools, runtimes, and compilers. LEARN MORE

First ONNX Meetup in Europe, 10 December 2026, Toulouse, France. Registration open, free but required.

First ONNX Meetup in Europe - Workshop on ONNX for Critical Systems, December 10, 2026, Toulouse, France and remote. Registration is open. DETAILS

KEY BENEFITS

Interoperability

Develop in your preferred framework without worrying about downstream inferencing implications. ONNX enables you to use your preferred framework with your chosen inference engine.

SUPPORTED FRAMEWORKS

Hardware Access

ONNX makes it easier to access hardware optimizations. Use ONNX-compatible runtimes and libraries designed to maximize performance across hardware.

SUPPORTED ACCELERATORS

COMMUNITY

ONNX is a community project.

Our active community thrives under our open governance structure, which provides transparency and inclusion. We encourage you to engage and contribute.

Chat with us on Slack
Join a Special Interest Group (SIG)
Join a Working Group
Check out our contribution guide

Support community participation by contributing to the ONNX Community Travel Fund.

WE ARE AN LFAI GRADUATE PROJECT

NEWS AND ANNOUNCEMENTS