SEA-LION-v4.8: A Technical Report

Adila Aulia; Ahmed Dabeer; Ahn Jeongmi; Antonyrex Sajeban; Chan Hok Teng Adwin; Cheng Zi Yi Nicholas; Choa Hsueh Mei Esther; Heng Jonathan; Jann Railey Estrada Montalan; Lee Chwan Ren; Leong Wai Yi; Leong Wei Qi; Liew Rachel; Limkonchotiwat Peerat; Muhammad Ridzuan Bin Mokhtar; Nagarajan Karthik; Ng Boon Cheong Raymond; Ngee Chia Tai; Ngui Jian Gang; Nguyen Thanh Ngan; Ong Tat-Wee David; Pereira Mark; Phang Shi Wei Benjamin; Poon Joseph; Rengarajan Hamsawardhini; Susanto Yosephine; Sutaveephamochanon Anocha; Tan Choon Meng; Tan Chor Phin Evelyn; Tan Le Min Sheryl; Tan Siao Wei Jessica; Tan Yixian; Tasawong Panuthep; Tee Jun Yun; Teng Kok Wai Walter; Teo Eng Sipp Leslie; Tjhi William; Tuchinda Pume; Wu Donghang; Yong Xianbin; Zhang Zhou

arXiv · 2609.18310

SEA-LION-v4.8: A Technical Report

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Abstract

We introduce Nemotron-SEA-LION-v4.8, a family of Southeast Asian Languages In One Network (SEA-LION) models built upon NVIDIA Nemotron 3. The family includes 30B-A3B and 120B-A12B models, with both continued-pretrained base checkpoints and post-trained variants. We adapt the models using Southeast Asian, reasoning, code, and multilingual parallel data, followed by post-training with supervised fine-tuning and online on-policy distillation. On SEA-HELM, the 30B-A3B model improves the overall SEA score from 46.06 to 51.57, while the 120B-A12B model improves from 49.30 to 63.44. Across seven Southeast Asian languages, we observe broad capability gains with the 120B-A12B model showing broader and more consistent improvements across tasks.

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Adila Aulia, Ahmed Dabeer, Ahn Jeongmi, Antonyrex Sajeban, Chan Hok Teng Adwin, Cheng Zi Yi Nicholas, Choa Hsueh Mei Esther, Heng Jonathan, Jann Railey Estrada Montalan, Lee Chwan Ren, Leong Wai Yi, Leong Wei Qi, Liew Rachel, Limkonchotiwat Peerat, Muhammad Ridzuan Bin Mokhtar, Nagarajan Karthik, Ng Boon Cheong Raymond, Ngee Chia Tai, Ngui Jian Gang, Nguyen Thanh Ngan, Ong Tat-Wee David, Pereira Mark, Phang Shi Wei Benjamin, Poon Joseph, Rengarajan Hamsawardhini, Susanto Yosephine, Sutaveephamochanon Anocha, Tan Choon Meng, Tan Chor Phin Evelyn, Tan Le Min Sheryl, Tan Siao Wei Jessica, Tan Yixian, Tasawong Panuthep, Tee Jun Yun, Teng Kok Wai Walter, Teo Eng Sipp Leslie, Tjhi William, Tuchinda Pume, Wu Donghang, Yong Xianbin, Zhang Zhou. 2026-09-18. SEA-LION-v4.8: A Technical Report. https://arxiv.org/abs/2609.18310

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