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arXiv · 2607.25857

Shieldstral

Antonia Calvi·Avinash Sooriyarachchi·Giada Pistilli·Guillaume Lample·Maarten Buyl·Maximilian Augustin·Maximilian Müller·Pierre Stock·Tom Bewley·Wassim Bouaziz·Yimu Pan·Abdelaziz Bounhar·Abhijeet Somani·Aditi Kabra·Adrian Valente·Adrien Petralia·Adrien Sadé·Alan Jeffares·Albert Jiang·Aleksandr Timashov·Alexandre Cahill·Alexandre Gavaudan·Alexandre Laval·Alexandre Sablayrolles·Amélie Héliou·Amos You·André Jonasson·Andrew Bai·Andrew Ehrenberg·Andrew Zhao·Angele Lenglemetz·Anmol Agarwal·Arata Suzuki·Arjun Majumdar·Arthur Fournier·Artjom Joosen·Aylin Guliz Akkus·Aysenur Karaduman·Baptiste Bout·Baptiste Rozière·Baudouin De Monicault·Benjamin Holzschuh·Benjamin Lefaudeux·Benjamin Tibi·Bernhard Stadlbauer·Błażej Osiński·Camille Le Scao·Chaoran Yu·Charlotte Cronjäger·Chen-Yo Sun·Chris Bamford·Christian Wallenwein·Christophe Renaudin·Clémence Lanfranchi·Corentin Barreau·Corentin Sautier·Cristiana-Diana Diaconu·Cyprien Courtot·Daniel Marczak·Darius Dabert·Diego de Las Casas·Dominik Nuss·Dylan Rubini·Dzmitry Soupel·Elizaveta Demyanenko·Elliot Chane-Sane·Emilien Fugier·Emmanuel Gottlob·Erik Aas·Etienne Goffinet·Étienne Millon·Eujeong Choi·Fabian Paischer·Fabian Schlager·Faruk Ahmed·Federico Baldassarre·Filip Szatkowski·Florian Wiesner·Gabrielle Berrada·Gaëtan Ecrepont·Gaétan Lepage·Gaspard Blanchet·Gaspard Donada-Vidal·Gauthier Delerce·Gauthier Guinet·Genevieve Hayes·Georgii Novikov·Gianluca Galletti·Guillaume Breton·Guillaume Kunsch·Guillaume Martin·Guillaume Raille·Gunjan Dhanuka·Gunshi Gupta·Han Zhou·Harshil Shah·Hasan Furkan Vural·Hédi Hadiji·Hope McGovern·Hugo Cisneros
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Abstract

We introduce Shieldstral, a 3B-parameter policy-adaptive multimodal safety classifier that matches or outperforms models nearly 7$\times$ its size on text safety benchmarks and sets a new state of the art on multimodal safety classification. Shieldstral formulates content moderation as a binary question-answering task. This simple formulation unifies diverse moderation tasks into a single yes/no problem, enabling heterogeneous safety datasets with divergent taxonomies to be consolidated under one training framework. We present the data construction recipe, covering curation and generation of approximately 54.1M samples and a fine-grained evaluation set to evaluate policy adaptability. Together, these enable a small adaptive model to match or outperform much larger models.

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Antonia Calvi, Avinash Sooriyarachchi, Giada Pistilli, Guillaume Lample, Maarten Buyl, Maximilian Augustin, Maximilian Müller, Pierre Stock, Tom Bewley, Wassim Bouaziz, Yimu Pan, Abdelaziz Bounhar, Abhijeet Somani, Aditi Kabra, Adrian Valente, Adrien Petralia, Adrien Sadé, Alan Jeffares, Albert Jiang, Aleksandr Timashov, Alexandre Cahill, Alexandre Gavaudan, Alexandre Laval, Alexandre Sablayrolles, Amélie Héliou, Amos You, André Jonasson, Andrew Bai, Andrew Ehrenberg, Andrew Zhao, Angele Lenglemetz, Anmol Agarwal, Arata Suzuki, Arjun Majumdar, Arthur Fournier, Artjom Joosen, Aylin Guliz Akkus, Aysenur Karaduman, Baptiste Bout, Baptiste Rozière, Baudouin De Monicault, Benjamin Holzschuh, Benjamin Lefaudeux, Benjamin Tibi, Bernhard Stadlbauer, Błażej Osiński, Camille Le Scao, Chaoran Yu, Charlotte Cronjäger, Chen-Yo Sun, Chris Bamford, Christian Wallenwein, Christophe Renaudin, Clémence Lanfranchi, Corentin Barreau, Corentin Sautier, Cristiana-Diana Diaconu, Cyprien Courtot, Daniel Marczak, Darius Dabert, Diego de Las Casas, Dominik Nuss, Dylan Rubini, Dzmitry Soupel, Elizaveta Demyanenko, Elliot Chane-Sane, Emilien Fugier, Emmanuel Gottlob, Erik Aas, Etienne Goffinet, Étienne Millon, Eujeong Choi, Fabian Paischer, Fabian Schlager, Faruk Ahmed, Federico Baldassarre, Filip Szatkowski, Florian Wiesner, Gabrielle Berrada, Gaëtan Ecrepont, Gaétan Lepage, Gaspard Blanchet, Gaspard Donada-Vidal, Gauthier Delerce, Gauthier Guinet, Genevieve Hayes, Georgii Novikov, Gianluca Galletti, Guillaume Breton, Guillaume Kunsch, Guillaume Martin, Guillaume Raille, Gunjan Dhanuka, Gunshi Gupta, Han Zhou, Harshil Shah, Hasan Furkan Vural, Hédi Hadiji, Hope McGovern, Hugo Cisneros. 2026-07-28. Shieldstral. https://arxiv.org/abs/2607.25857

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