OpenThai-SystemOne — W8A8-INT8

OpenThai-SystemOne is an open Thai + English System One decision model: one forward pass answers typed questions (choice over up to 255 options, ordinal score, yes/no noul) about a text / JSON state with calibrated probabilities, no text generation. It is a Qwen3.5-0.8B text tower (Thai continued pre-training) plus a 256-slot decision head. This repo is a quantization of v0.3 (commit f3709948).

What is quantized: the Linear layers of the tower. The token embeddings, the 256-slot decision head and the per-type temperatures stay in bf16. Quantization therefore only perturbs the hidden state the head reads.

Format: INT8 W8A8 (dynamic per-token activations). compressed-tensors (llm-compressor) checkpoint. Loaded through transformers the weights are decompressed to bf16 at load time (same speed as bf16, smaller download); native FP8 / INT8 / FP4 kernels need a runtime with this architecture (the decision head is custom, so vLLM does not serve it out of the box).

Size: 1009 MB (bf16 original: 1,509 MB).

Usage

pip install torch transformers safetensors pydantic && pip install compressed-tensors
from transformers import AutoModel, AutoTokenizer        # trust_remote_code files are in this repo
model = AutoModel.from_pretrained("iapp/OpenThai-SystemOne-W8A8-INT8", trust_remote_code=True)
# or with the pip package (git+https://github.com/iapp-technology/openthai-systemone):
from openthai_systemone import SystemOneClient
c = SystemOneClient("iapp/OpenThai-SystemOne-W8A8-INT8")
r = c.system_one("ร้านนี้อาหารอร่อยมาก แต่รอนานเกือบชั่วโมง", {"sentiment": {"type": "choice", "instructions": "ความรู้สึก",
                 "criteria": {"บวก": None, "ลบ": None, "กลาง": None}}})

Accuracy vs the bf16 original (same records, single option order, first 800 per set)

Macro: public 73.7 (original 74.3), Thai 79.9 (original 80.1).

subset bf16 original this Δ
public 13-subset bench
aegis2 (noul) 83.2 82.8 -0.4
boolq (noul) 79.7 79.7 +0.0
civil_comments (noul) 79.0 78.7 -0.3
helpsteer2 (score) 41.6 41.6 +0.0
massive-de-DE (choice) 88.3 88.3 +0.0
massive-en-US (choice) 88.3 88.3 +0.0
multinli (choice) 89.0 89.3 +0.3
paws (noul) 94.0 93.2 -0.8
pubmedqa (choice) 64.0 63.2 -0.8
squad2 (noul) 89.3 88.0 -1.3
summeval-consistency (score) 75.0 75.0 +0.0
summeval-relevance (score) 21.7 18.3 -3.3
vitaminc-dev (choice) 72.5 72.0 -0.5
macro, public 13-subset bench 74.3 73.7 -0.6
Thai held-out / eval sets
banking77 (choice) 59.1 58.8 -0.4
contrastive_th (choice) 80.7 81.1 +0.3
contrastive_th (noul) 83.5 84.3 +0.8
contrastive_th (score) 78.6 75.0 -3.6
massive_th (choice) 90.6 90.1 -0.5
prachathai (choice) 98.3 98.3 +0.0
prachathai (noul) 93.4 93.1 -0.3
sib200_th (choice) 77.9 78.9 +1.0
wisesight (choice) 48.9 49.8 +0.9
wongnai (score) 64.5 65.1 +0.6
xlam_tools (choice) 99.4 99.4 +0.0
xnli_th (choice) 79.8 79.1 -0.6
xnli_th (noul) 86.8 86.0 -0.8
macro, Thai held-out / eval sets 80.1 79.9 -0.2

Notes

  • Scores are single-option-order accuracy on the first 800 records of each set (scripts/06_eval.py --limit 800), the same records for the original and the quantization. score subsets report exact level accuracy.
  • Base model, data, training and the full benchmark tables: iapp/OpenThai-SystemOne.
  • License Apache-2.0 (same as the base). Built by iApp Technology / OpenThaiGPT.
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