IFM released K2 Horizon: six Apache-2.0 models with the entire training lifecycle opened, not just weights.

375B-A23B, 36B-A4B, 32B, 7B, 3.7B and 0.9B, sharing one architecture, vocabulary, training methodology and eval infrastructure. For every model they publish intermediate checkpoints, training data or the data-construction recipe, training code, configs, fine-grained logs and eval results, including the agentic post-training stages, which no other open family has exposed. IFM claims SOTA in class for the 0.9B, 3.7B and 7B tiers, with the 0.9B above 48 on AIME 2026, and a new Mixture-of-Value-Attention mechanism in the 36B-A4B. IFM