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arXiv · 2512.20848

Nemotron 3 Nano: Open, Efficient Mixture-of-Experts Hybrid Mamba-Transformer Model for Agentic Reasoning

NVIDIA·:·Aaron Blakeman·Aaron Grattafiori·Aarti Basant·Abhibha Gupta·Abhinav Khattar·Adi Renduchintala·Aditya Vavre·Akanksha Shukla·Akhiad Bercovich·Aleksander Ficek·Aleksandr Shaposhnikov·Alex Kondratenko·Alexander Bukharin·Alexandre Milesi·Ali Taghibakhshi·Alisa Liu·Amelia Barton·Ameya Sunil Mahabaleshwarkar·Amir Klein·Amit Zuker·Amnon Geifman·Amy Shen·Anahita Bhiwandiwalla·Andrew Tao·Ann Guan·Anubhav Mandarwal·Arham Mehta·Ashwath Aithal·Ashwin Poojary·Asif Ahamed·Asma Kuriparambil Thekkumpate·Ayush Dattagupta·Banghua Zhu·Bardiya Sadeghi·Barnaby Simkin·Ben Lanir·Benedikt Schifferer·Besmira Nushi·Bilal Kartal·Bita Darvish Rouhani·Boris Ginsburg·Brandon Norick·Brandon Soubasis·Branislav Kisacanin·Brian Yu·Bryan Catanzaro·Carlo del Mundo·Chantal Hwang·Charles Wang·Cheng-Ping Hsieh·Chenghao Zhang·Chenhan Yu·Chetan Mungekar·Chintan Patel·Chris Alexiuk·Christopher Parisien·Collin Neale·Damon Mosk-Aoyama·Dan Su·Dane Corneil·Daniel Afrimi·Daniel Rohrer·Daniel Serebrenik·Daria Gitman·Daria Levy·Darko Stosic·David Mosallanezhad·Deepak Narayanan·Dhruv Nathawani·Dima Rekesh·Dina Yared·Divyanshu Kakwani·Dong Ahn·Duncan Riach·Dusan Stosic·Edgar Minasyan·Edward Lin·Eileen Long·Eileen Peters Long·Elena Lantz·Ellie Evans·Elliott Ning·Eric Chung·Eric Harper·Eric Tramel·Erick Galinkin·Erik Pounds·Evan Briones·Evelina Bakhturina·Faisal Ladhak·Fay Wang·Fei Jia·Felipe Soares·Feng Chen·Ferenc Galko·Frankie Siino·Gal Hubara Agam·Ganesh Ajjanagadde
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Abstract

We present Nemotron 3 Nano 30B-A3B, a Mixture-of-Experts hybrid Mamba-Transformer language model. Nemotron 3 Nano was pretrained on 25 trillion text tokens, including more than 3 trillion new unique tokens over Nemotron 2, followed by supervised fine tuning and large-scale RL on diverse environments. Nemotron 3 Nano achieves better accuracy than our previous generation Nemotron 2 Nano while activating less than half of the parameters per forward pass. It achieves up to 3.3x higher inference throughput than similarly-sized open models like GPT-OSS-20B and Qwen3-30B-A3B-Thinking-2507, while also being more accurate on popular benchmarks. Nemotron 3 Nano demonstrates enhanced agentic, reasoning, and chat abilities and supports context lengths up to 1M tokens. We release both our pretrained Nemotron 3 Nano 30B-A3B Base and post-trained Nemotron 3 Nano 30B-A3B checkpoints on Hugging Face.

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NVIDIA, :, Aaron Blakeman, Aaron Grattafiori, Aarti Basant, Abhibha Gupta, Abhinav Khattar, Adi Renduchintala, Aditya Vavre, Akanksha Shukla, Akhiad Bercovich, Aleksander Ficek, Aleksandr Shaposhnikov, Alex Kondratenko, Alexander Bukharin, Alexandre Milesi, Ali Taghibakhshi, Alisa Liu, Amelia Barton, Ameya Sunil Mahabaleshwarkar, Amir Klein, Amit Zuker, Amnon Geifman, Amy Shen, Anahita Bhiwandiwalla, Andrew Tao, Ann Guan, Anubhav Mandarwal, Arham Mehta, Ashwath Aithal, Ashwin Poojary, Asif Ahamed, Asma Kuriparambil Thekkumpate, Ayush Dattagupta, Banghua Zhu, Bardiya Sadeghi, Barnaby Simkin, Ben Lanir, Benedikt Schifferer, Besmira Nushi, Bilal Kartal, Bita Darvish Rouhani, Boris Ginsburg, Brandon Norick, Brandon Soubasis, Branislav Kisacanin, Brian Yu, Bryan Catanzaro, Carlo del Mundo, Chantal Hwang, Charles Wang, Cheng-Ping Hsieh, Chenghao Zhang, Chenhan Yu, Chetan Mungekar, Chintan Patel, Chris Alexiuk, Christopher Parisien, Collin Neale, Damon Mosk-Aoyama, Dan Su, Dane Corneil, Daniel Afrimi, Daniel Rohrer, Daniel Serebrenik, Daria Gitman, Daria Levy, Darko Stosic, David Mosallanezhad, Deepak Narayanan, Dhruv Nathawani, Dima Rekesh, Dina Yared, Divyanshu Kakwani, Dong Ahn, Duncan Riach, Dusan Stosic, Edgar Minasyan, Edward Lin, Eileen Long, Eileen Peters Long, Elena Lantz, Ellie Evans, Elliott Ning, Eric Chung, Eric Harper, Eric Tramel, Erick Galinkin, Erik Pounds, Evan Briones, Evelina Bakhturina, Faisal Ladhak, Fay Wang, Fei Jia, Felipe Soares, Feng Chen, Ferenc Galko, Frankie Siino, Gal Hubara Agam, Ganesh Ajjanagadde. 2025-12-23. Nemotron 3 Nano: Open, Efficient Mixture-of-Experts Hybrid Mamba-Transformer Model for Agentic Reasoning. https://arxiv.org/abs/2512.20848

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