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Main Authors: Rastogi, Abhinav, Yang, Adam, Jiang, Albert Q., Liu, Alexander H., Sablayrolles, Alexandre, Héliou, Amélie, Martin, Amélie, Agarwal, Anmol, Ehrenberg, Andy, Lo, Andy, Roux, Antoine, Darcet, Arthur, Mensch, Arthur, Bout, Baptiste, Rozière, Baptiste, De Monicault, Baudouin, Bamford, Chris, Wallenwein, Christian, Renaudin, Christophe, Lanfranchi, Clémence, Denoix, Clément, Barreau, Corentin, Mizelle, Darius Dabert Devon, Casas, Diego de las, Chane-Sane, Elliot, Fugier, Emilien, Hanna, Emma Bou, Berrada, Gabrielle, Delerce, Gauthier, Guinet, Gauthier, Novikov, Georgii, Neubig, Graham, Lample, Guillaume, Martin, Guillaume, Jaju, Himanshu, Ludziejewski, Jan, Rute, Jason, Delignon, Jean-Malo, Chabran, JeanHadrien, Studnia, Joachim, Barmentlo, Joep, Amar, Jonas, Roberts, Josselin Somerville, Denize, Julien, Saxena, Karan, Yadav, Karmesh, Khandelwal, Kartik, Chandu, Khyathi Raghavi, Jain, Kush, Lavaud, Lélio Renard, Blier, Léonard, Zhao, Lingxiao, Martin, Louis, Saulnier, Lucile, Gao, Luyu, Pellat, Marie, Guillaumin, Mathilde, Felardos, Mathis, Dinot, Matthieu, Darrin, Maxime, Augustin, Maximilian, Seznec, Mickaël, Gupta, Neha, Raghuraman, Nikhil, Duchenne, Olivier, Wang, Patricia, von Platen, Patrick, Saffer, Patryk, Jacob, Paul, Wambergue, Paul, Kurylowicz, Paula, Chagniot, Philomène, Stock, Pierre, Agrawal, Pravesh, Delacourt, Rémi, Soletskyi, Roman, Sauvestre, Romain, Vaze, Sagar, Gandhi, Sanchit, Subramanian, Sandeep, Dalal, Shashwat, Gandhi, Siddharth, Ghosh, Soham, Mishra, Srijan, Aithal, Sumukh, Antoniak, Szymon, Scao, Teven Le, Lavril, Thibaut, Schueller, Thibault, Foubert, Thomas, Robert, Thomas, Wang, Thomas, Lacroix, Timothée, Bewley, Tom, Nemychnikova, Valeriia, Paltz, Victor, Richard, Virgile, Li, Wen-Ding, Marshall, William, Wang, Xingyao, Zhang, Xuanyu, Wan, Yihan, Tang, Yunhao
Format: Preprint
Published: 2025
Subjects:
Software Engineering
Artificial Intelligence
Online Access:https://arxiv.org/abs/2509.25193
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Table of Contents:
  • We introduce Devstral-Small, a lightweight open source model for code agents with the best performance among models below 100B size. In this technical report, we give an overview of how we design and develop a model and craft specializations in agentic software development. The resulting model, Devstral-Small is a small 24B model, fast and easy to serve. Despite its size, Devstral-Small still attains competitive performance compared to models more than an order of magnitude larger.

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