OpenThaiGPT 1.6 and R1: Thai-Centric Open Source and Reasoning Large Language Models

Sumeth Yuenyong, Thodsaporn Chay-intr, Kobkrit Viriyayudhakorn
4/2/2025
cs.CL

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Abstract

We present OpenThaiGPT 1.6 and R1 (OTG-1.6 and OTG-R1), Thai-centric Large Language Models (LLMs) developed through distinct methodologies to enhance generalization and reasoning capabilities. OTG-1.6 employs Task Arithmetic model merging for broad generalization, while OTG-R1 integrates multi-stage training with the Less-Is-More Reasoning Hypothesis (LIMO) for advanced reasoning. Benchmark evaluations demonstrate superior performance across Thai language tasks, achieving competitive results against larger-scale open-source Thai LLMs. This paper details the proposed models, training processes, benchmarks, and results, highlighting improvements over previous models and establishing new performance standards for Thai-centric LLMs.

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Cite this paper

@article{yuenyong2025openthaigpt,
  title  = {OpenThaiGPT 1.6 and R1: Thai-Centric Open Source and Reasoning Large Language Models},
  author = {Sumeth Yuenyong and Thodsaporn Chay-intr and Kobkrit Viriyayudhakorn},
  year   = {2025},
  eprint = {2504.01789},
  archivePrefix = {arXiv},
  url    = {http://arxiv.org/abs/2504.01789v1}
}

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