Raising Bars, Not Parameters: LilMoo Compact Language Model for Hindi

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Hauptverfasser: Fatimah, Shiza, Sen, Aniket, Falk, Sophia, Mai, Florian, Flek, Lucie, Corrêa, Nicholas Kluge
Format: Preprint
Veröffentlicht: 2026
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author Fatimah, Shiza
Sen, Aniket
Falk, Sophia
Mai, Florian
Flek, Lucie
Corrêa, Nicholas Kluge
author_facet Fatimah, Shiza
Sen, Aniket
Falk, Sophia
Mai, Florian
Flek, Lucie
Corrêa, Nicholas Kluge
contents The dominance of large multilingual foundation models has widened linguistic inequalities in Natural Language Processing (NLP), often leaving low-resource languages underrepresented. This paper introduces LilMoo, a 0.6-billion-parameter Hindi language model trained entirely from scratch to address this gap. Unlike prior Hindi models that rely on continual pretraining from opaque multilingual foundations, LilMoo is developed through a fully transparent and reproducible pipeline optimized for limited compute environments. We construct a high-quality Hindi corpus (GigaLekh) filtered through both heuristic and learned (LLM-as-a-judge) methods, complemented by bilingual augmentation with curated English data. Using this dataset, we explore various training recipes for small-scale language models. Across comprehensive evaluation suites, LilMoo consistently outperforms comparably sized multilingual baselines such as Qwen2.5-0.5B and Qwen3-0.6B, demonstrating that well-designed language-specific pretraining can rival large multilingual models at the sub-billion-parameter range.
format Preprint
id arxiv_https___arxiv_org_abs_2603_03508
institution arXiv
publishDate 2026
record_format arxiv
spellingShingle Raising Bars, Not Parameters: LilMoo Compact Language Model for Hindi
Fatimah, Shiza
Sen, Aniket
Falk, Sophia
Mai, Florian
Flek, Lucie
Corrêa, Nicholas Kluge
Computation and Language
Artificial Intelligence
The dominance of large multilingual foundation models has widened linguistic inequalities in Natural Language Processing (NLP), often leaving low-resource languages underrepresented. This paper introduces LilMoo, a 0.6-billion-parameter Hindi language model trained entirely from scratch to address this gap. Unlike prior Hindi models that rely on continual pretraining from opaque multilingual foundations, LilMoo is developed through a fully transparent and reproducible pipeline optimized for limited compute environments. We construct a high-quality Hindi corpus (GigaLekh) filtered through both heuristic and learned (LLM-as-a-judge) methods, complemented by bilingual augmentation with curated English data. Using this dataset, we explore various training recipes for small-scale language models. Across comprehensive evaluation suites, LilMoo consistently outperforms comparably sized multilingual baselines such as Qwen2.5-0.5B and Qwen3-0.6B, demonstrating that well-designed language-specific pretraining can rival large multilingual models at the sub-billion-parameter range.
title Raising Bars, Not Parameters: LilMoo Compact Language Model for Hindi
topic Computation and Language
Artificial Intelligence
url https://arxiv.org/abs/2603.03508