Transforming a trained model into an executable implementation must preserve the model’s intended semantics. Focusing on models specified using the ONNX standard, this presentation examines the requirements for precise and unambiguous syntax and semantics when models are interpreted or translated into lower-level representations. It highlights the limitations of ONNX in certification-oriented contexts and discusses the need for a safety-related ONNX profile. The presentation also introduces the objectives, methodology, and initial results of the SONNX Working Group, which aims to align the use of ONNX with industrial and safety-critical requirements without diverging from the standard.