K2 Horizon just shipped as six new fully open models — developers aren’t fully convinced

The Institute of Foundation Models (IFM) launched K2 Horizon, a suite of six open-source AI models ranging from 0.9B to 375B parameters, providing extensive training data, code, and checkpoints to support transparency and reproducibility. While all models have downloadable weights, some training components are pending release, and the 32B model is an interim checkpoint version. IFM emphasizes full openness beyond weights to enable scientific scrutiny and adaptation by developers.