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Open Source Models

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Wednesday, 9 September 2026

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

The New Stack 1 month ago 24 ● 2 sources

IFM shipped K2 Horizon, a set of six “fully open” foundation models meant to publish the full training lifecycle beyond just model weights. The model sizes range from 0.9 billion to 375 billion parameters. At launch, some training data, code, or checkpoints were delayed or incomplete for parts of the fleet (including a Stage 1 32B checkpoint), and developers questioned whether the releases enable end-to-end reproducibility and full inspection (including missing compute details).

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AI Evaluation Model Training Model Releases Open Source Models

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