This market asks whether a standardized categorical approach to machine learning models will emerge by the end of 2025. For positive resolution, we need to see: 1. A published framework that uses category theory to describe ML model architectures, training procedures, and composition 2. At least two major research labs or organizations adopting this framework 3. Implementation in code that enables practical composition of models using categorical principles 4. Citations in at least 5 peer-reviewed papers that build upon this framework Resolution will be based on evidence of all four criteria being met by December 31, 2025.