OpenThaiGPT 1.5: A Thai-Centric Open Source Large Language Model
1
Issued Date
2026-01-01
Resource Type
ISSN
03029743
eISSN
16113349
Scopus ID
2-s2.0-105011097769
Journal Title
Lecture Notes in Computer Science
Volume
15837 LNCS
Start Page
210
End Page
219
Rights Holder(s)
SCOPUS
Bibliographic Citation
Lecture Notes in Computer Science Vol.15837 LNCS (2026) , 210-219
Suggested Citation
Yuenyong S., Viriyayudhakorn K., Piyatumrong A., Jaroenkantasima J. OpenThaiGPT 1.5: A Thai-Centric Open Source Large Language Model. Lecture Notes in Computer Science Vol.15837 LNCS (2026) , 210-219. 219. doi:10.1007/978-3-031-97144-0_19 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/114548
Title
OpenThaiGPT 1.5: A Thai-Centric Open Source Large Language Model
Corresponding Author(s)
Other Contributor(s)
Abstract
OpenThaiGPT 1.5 is an advanced Thai language chat model based on Qwen v2.5, finetuned on over 2,000,000 Thai instruction pairs. This report provides an engineering perspective on the model’s development, capabilities, and performance. We discuss the model’s architecture, training process, and key features, including multi-turn conversation support, Retrieval Augmented Generation (RAG) compatibility, and tool-calling functionality. Benchmark results demonstrate OpenThaiGPT 1.5’s state-of-the-art performance on various Thai language tasks, outperforming other open-source Thai language models. We also address practical considerations such as GPU memory requirements and deployment strategies.