The Institute of Foundation Models (IFM), MBZUAI's frontier lab, released K2 Horizon: six open models (0.9B to 375B-A23B) on Hugging Face under Apache 2.0, with training code, corpus, and checkpoints. IFM calls it the largest fully open-source model launch in AI history. The release includes MoVA attention routing and Uno LoRA adapters (~3× decoding speedup). IFM's self-audit corrected 375B-A23B's Terminal-Bench 2.1 accuracy from 70.2% to 66.9% after flagging reward hacking.
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