README.md

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OpenThai

Free, open-weight Thai large language models.

formerly OpenThaiGPT

Website · Leaderboard · Ollama · GitHub · Discord · Papers

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Thai is spoken by 70 million people and served by almost no open models. We build them — trained on Thai data, evaluated on Thai benchmarks, and released open-weight so that Thai organisations can self-host and keep Thai data in Thailand.

Run by the AI Entrepreneur Association of Thailand (AIEAT) with iApp Technology and a community of volunteer researchers. A contributing member of Thailand's national ThaiLLM initiative.

Which model should I use?

Need	Model	Size
⚖️ Thai law, statute citation, legal RAG	OpenThai 2.0 Legal ← newest	30B MoE (~3B active)
🧠 Reasoning, maths, logic, code	OpenThaiGPT R1	32B
💬 General Thai chat and coding	OpenThaiGPT 1.6	72B
💻 Limited GPU	OpenThaiGPT 1.5	7B / 14B

OpenThai 2.0 Legal is published under the iapp org, where it is maintained. It is an OpenThai project model — that is the canonical copy, not a mirror.

Papers

• OpenThaiGPT 1.6 and R1: Thai-Centric Open Source and Reasoning Large Language Models (2025)
• OpenThaiGPT 1.5: A Thai-Centric Open Source Large Language Model (2024) · Springer LNCS

Get involved

We need help with Thai evaluation data, domain fine-tunes (medical, government, education), and inference tooling. Start in Discord.

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OpenThai (formerly OpenThaiGPT) — openthai.aieat.or.th