ONNX v1.21.0 Released — Introducing Opset 26, New CumProd Operator, 2-Bit Type Support, and More

Author: Dr. Andreas Fehlner, ONNX Steering Committee The ONNX (Open Neural Network Exchange) community is excited to announce the release of ONNX v1.21.0 , a significant step forward in advancing open standards for machine learning interoperability. This release introduces Opset 26 , along with new operators and precision types that enable richer, more flexible model representations for modern AI workloads. Notably, support for 2-bit data types and the addition of CumProd and BitCast operators…