Open Neural Network Exchange

Open Neural Network Exchange (ONNX)
Original authorsFacebook, Microsoft
DeveloperLinux Foundation
Initial releaseSeptember 2017 (2017-09)
Stable release
1.20.0 / 1 December 2025 (1 December 2025)
Written inC++, Python
Operating systemWindows, Linux
TypeArtificial intelligence ecosystem
Licenseinitially MIT License;
later changed to Apache License 2.0
Websiteonnx.ai 
Repository

The Open Neural Network Exchange (ONNX) [ˈɒnɪks] is an open-source artificial intelligence ecosystem of technology companies and research organizations that establish open standards for representing machine learning algorithms and software tools to enable a standard format for representing machine learning models. ONNX is available on GitHub.