OpenThai-SystemOne: An 0.8B Open Model That Answers Typed Decisions With Calibrated Probabilities
lmoroney · x · 2026-09-24
iApp Technology and OpenThai released OpenThai-SystemOne, an Apache-2.0 open-weight 0.8B model built for typed decisions rather than free-form generation, based on Qwen3.5-0.8B-Base.
Design: after continued Thai/English pretraining, the LM head is replaced with a 256-way slot softmax. You pass a state (text or JSON) plus typed questions and get a probability distribution in one forward pass:
- choice: up to 255 named options, returns the selected option, full probability vector, and confidence;
- score: 2-10 ordered levels, returns a probability-weighted fractional score;
- noul: returns p(yes). Slot 255 is abstain.
Context up to 64K tokens, and the API mirrors TypeSafe's System One SDK, so existing code can point at this checkpoint with minimal changes. Target use cases: ticket triage, intent detection, moderation flags, RAG relevance, verifying other models' output, and picking the next action for computer-use agents. The author also covers the vendor-reported v0.1→v0.3 climb and a practical afternoon exercise to slot it next to chat and tool models.
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