CWM: An Open-Weights LLM for Research on Code Generation with World Models. - FAIR CodeGen team; Jade Copet; Quentin Carbonneaux; Gal Cohen; Jonas Gehring; Jacob Kahn; Jannik Kossen; Felix Kreuk; Emily McMilin; Michel Meyer; Yuxiang Wei 003; David Zhang; et al. (CoRR, 2025)