Laguna M.1/XS.2 Technical Report
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arXiv
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| Formato: | Preprint |
| Publicado: |
2026
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| Acceso en línea: | |
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| author | Abadji, Julien Abdin, Marah Adams, Connor Alcaide, Eric Altun, Mustafa Artoni, Michele Bao, Junze Barar, Uday Bekiaris, Vassilis Bessonov, Arkadii Bütikofer, Benjamin Chang, Jonathan Chen, Yen-Chun Chernenkov, Dmitry Chi, Yang Christianos, Filippos Christopoulou, Fenia Ciocoiu, Razvan-Andrei Cohen, Tzachi Coppel, Yohann Emelianenko, Dmitrii Fergerson, Brandon Fitzgerald, Brian Gallé, Matthias Golonzovskyi, Alex Grigorev, George Hao, Yiyang Hensel, Christian Huenermann, Jan Ji, Ye Joshi, Sarthak Kant, Eiso Khandpur, Kabir Kim, Seonghyeon Kirichenko, Vladimir Kocasarac, Umut Kochik, Ilya Komarov, Ivan Kong, Chaerin Koul, Anurag Lacroix, François-Joseph Laktionov, Sergei Long, Waren Malartic, Quentin Markovtsev, Vadim Marques, Afonso McHardy, Robert Mocholí, Carlos Monakhov, Dmitry Morris, Adam Muller, Martin Mürtz, Christian Nabel, Robin Nguyen, Thien Novosel, Rok Ozog, Szymon Patankar, Aalhad Petrov, Aleksei Piché, Alexandre Pignet, Arthur Poncu, Teodor Potter, Phil Rakowski, Alexander Ritschard, Pierre-Yves Roberts, Jay Rowell, Joe Sarna, Piotr Savalle, Pierre-André Sazanovich, Uladzislau Shapovalov, Nikita Shevchenko, Arsenii Shilkov, Mikhail Sokol, Andrei Soliman, Mohamed Stephenson, Jack Storchan, Victor Tantaru, Dragos-Constantin Tyurin, Artem Wälchli, Adrian Wang, Pengming Yang, Jianxiao Zayashnikov, Renat Martin, Alexander Zelenka Zinov, Nikolay Bercier, Caroline Caldeira, José Garcia, Margarida George, Tom Gharzai, Kabeer Hitchcock, Glenn Klingenberg, Carson Pinto, Ivo Randery, Varun Smith, Noah Sugako, Arina Warner, Jason |
| author_facet | Abadji, Julien Abdin, Marah Adams, Connor Alcaide, Eric Altun, Mustafa Artoni, Michele Bao, Junze Barar, Uday Bekiaris, Vassilis Bessonov, Arkadii Bütikofer, Benjamin Chang, Jonathan Chen, Yen-Chun Chernenkov, Dmitry Chi, Yang Christianos, Filippos Christopoulou, Fenia Ciocoiu, Razvan-Andrei Cohen, Tzachi Coppel, Yohann Emelianenko, Dmitrii Fergerson, Brandon Fitzgerald, Brian Gallé, Matthias Golonzovskyi, Alex Grigorev, George Hao, Yiyang Hensel, Christian Huenermann, Jan Ji, Ye Joshi, Sarthak Kant, Eiso Khandpur, Kabir Kim, Seonghyeon Kirichenko, Vladimir Kocasarac, Umut Kochik, Ilya Komarov, Ivan Kong, Chaerin Koul, Anurag Lacroix, François-Joseph Laktionov, Sergei Long, Waren Malartic, Quentin Markovtsev, Vadim Marques, Afonso McHardy, Robert Mocholí, Carlos Monakhov, Dmitry Morris, Adam Muller, Martin Mürtz, Christian Nabel, Robin Nguyen, Thien Novosel, Rok Ozog, Szymon Patankar, Aalhad Petrov, Aleksei Piché, Alexandre Pignet, Arthur Poncu, Teodor Potter, Phil Rakowski, Alexander Ritschard, Pierre-Yves Roberts, Jay Rowell, Joe Sarna, Piotr Savalle, Pierre-André Sazanovich, Uladzislau Shapovalov, Nikita Shevchenko, Arsenii Shilkov, Mikhail Sokol, Andrei Soliman, Mohamed Stephenson, Jack Storchan, Victor Tantaru, Dragos-Constantin Tyurin, Artem Wälchli, Adrian Wang, Pengming Yang, Jianxiao Zayashnikov, Renat Martin, Alexander Zelenka Zinov, Nikolay Bercier, Caroline Caldeira, José Garcia, Margarida George, Tom Gharzai, Kabeer Hitchcock, Glenn Klingenberg, Carson Pinto, Ivo Randery, Varun Smith, Noah Sugako, Arina Warner, Jason |
| contents | We present Laguna M.1 and Laguna XS.2, two Mixture-of-Experts foundation models built for long-horizon, agentic coding: M.1 has $225.8$B total parameters ($23.4$B activated per token) and XS.2 has $33.4$B total ($3$B activated). Both models were trained from scratch end-to-end inside the same internal system that we refer to as our Model Factory: a tightly-integrated stack of versioned data, training, evaluation, and inference components that turn model development into an industrial process. We describe the principles and design choices of the Model Factory and also detail the end-to-end training process of our models, throughout pre-training data and architecture, post-training stages, evaluation, and quantization.
On agentic software engineering and terminal benchmarks (SWE-bench Verified, SWE-bench Multilingual, SWE-Bench Pro, and Terminal-Bench 2.0) M.1 and XS.2 are competitive with state-of-the-art open models in their respective weight classes. Laguna XS.2 weights are released under Apache~2.0 at https://huggingface.co/collections/poolside/laguna-xs2. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_27605 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Laguna M.1/XS.2 Technical Report Abadji, Julien Abdin, Marah Adams, Connor Alcaide, Eric Altun, Mustafa Artoni, Michele Bao, Junze Barar, Uday Bekiaris, Vassilis Bessonov, Arkadii Bütikofer, Benjamin Chang, Jonathan Chen, Yen-Chun Chernenkov, Dmitry Chi, Yang Christianos, Filippos Christopoulou, Fenia Ciocoiu, Razvan-Andrei Cohen, Tzachi Coppel, Yohann Emelianenko, Dmitrii Fergerson, Brandon Fitzgerald, Brian Gallé, Matthias Golonzovskyi, Alex Grigorev, George Hao, Yiyang Hensel, Christian Huenermann, Jan Ji, Ye Joshi, Sarthak Kant, Eiso Khandpur, Kabir Kim, Seonghyeon Kirichenko, Vladimir Kocasarac, Umut Kochik, Ilya Komarov, Ivan Kong, Chaerin Koul, Anurag Lacroix, François-Joseph Laktionov, Sergei Long, Waren Malartic, Quentin Markovtsev, Vadim Marques, Afonso McHardy, Robert Mocholí, Carlos Monakhov, Dmitry Morris, Adam Muller, Martin Mürtz, Christian Nabel, Robin Nguyen, Thien Novosel, Rok Ozog, Szymon Patankar, Aalhad Petrov, Aleksei Piché, Alexandre Pignet, Arthur Poncu, Teodor Potter, Phil Rakowski, Alexander Ritschard, Pierre-Yves Roberts, Jay Rowell, Joe Sarna, Piotr Savalle, Pierre-André Sazanovich, Uladzislau Shapovalov, Nikita Shevchenko, Arsenii Shilkov, Mikhail Sokol, Andrei Soliman, Mohamed Stephenson, Jack Storchan, Victor Tantaru, Dragos-Constantin Tyurin, Artem Wälchli, Adrian Wang, Pengming Yang, Jianxiao Zayashnikov, Renat Martin, Alexander Zelenka Zinov, Nikolay Bercier, Caroline Caldeira, José Garcia, Margarida George, Tom Gharzai, Kabeer Hitchcock, Glenn Klingenberg, Carson Pinto, Ivo Randery, Varun Smith, Noah Sugako, Arina Warner, Jason Artificial Intelligence Software Engineering We present Laguna M.1 and Laguna XS.2, two Mixture-of-Experts foundation models built for long-horizon, agentic coding: M.1 has $225.8$B total parameters ($23.4$B activated per token) and XS.2 has $33.4$B total ($3$B activated). Both models were trained from scratch end-to-end inside the same internal system that we refer to as our Model Factory: a tightly-integrated stack of versioned data, training, evaluation, and inference components that turn model development into an industrial process. We describe the principles and design choices of the Model Factory and also detail the end-to-end training process of our models, throughout pre-training data and architecture, post-training stages, evaluation, and quantization. On agentic software engineering and terminal benchmarks (SWE-bench Verified, SWE-bench Multilingual, SWE-Bench Pro, and Terminal-Bench 2.0) M.1 and XS.2 are competitive with state-of-the-art open models in their respective weight classes. Laguna XS.2 weights are released under Apache~2.0 at https://huggingface.co/collections/poolside/laguna-xs2. |
| title | Laguna M.1/XS.2 Technical Report |
| topic | Artificial Intelligence Software Engineering |
| url | https://arxiv.org/abs/2605.27605 |