Model Card｜K2 Horizon 375B-A23B
K2 Horizon 375B-A23B (IFM/K2-Horizon-375B-A23B): released 2026-09-03 by the Institute of Foundation Models (under MBZUAI, Abu Dhabi), 375B total / 23B active parameters (MoE), 512K (524,288 tokens) native context, fully open under Apache-2.0 (weights, code, training data recipes, and intermediate checkpoints all public), no official API pricing (open weights, self-hosted); Terminal-Bench 2.1 70.2%, SWE Bench Pro 42.6%, SWE-Atlas-QnA 48.4% (highest of any model tested, open or closed); shipped alongside five sibling sizes — 36B-A4B (new MoVA sparse attention), 32B, 7B, 3.7B, 0.9B