2025 Let Me Think! A Long Chain-of-Thought Can Be Worth Exponentially Many Short Ones Parsa Mirtaheri, Ezra Edelman, Samy Jelassi, Eran Malach, and Enric Boix-Adsera In Advances in Neural Information Processing Systems 38, 2025 arXiv Direct Alignment with Heterogeneous Preferences Ali Shirali, Arash Nasr-Esfahany, Abdullah Alomar, Parsa Mirtaheri, Rediet Abebe, and Ariel Procaccia In Advances in Neural Information Processing Systems 38, 2025 arXiv