Developed by the Swiss AI Initiative as a collaborative effort between EPFL, ETH Zurich, and CSCS. Open weights, open data, open science. Fully OpenTraining data, code, weights, methods, and alignment principles — all documented and reproducible. Apertus is to AI as Open is to Source.Compliant at ScaleBuilt to meet EU AI Act requirements: the model respects opt-outs, removes PII, prevents memorization. A global foundation to build on.Run for PerformanceCompetitive with top open models at an equi...