
Base Model	`Qwen/Qwen3.6-27B`
Architecture	`Qwen3_5ForConditionalGeneration` (hybrid attention + ViT)
Parameters	27B language tower (quantized) + 27-layer ViT (BF16, unquantized)
Layers	64 hybrid (16 full_attention + 48 linear_attention GatedDeltaNet) + 1 MTP head
Quantization	W8A8 INT8 (per-channel weight + per-token dynamic activation)
Quantizer	AMD Quark `0.11.1` (`pack_method='reorder'`, vLLM-native key naming)
Model Size	~29 GB (single safetensors)
Original Size	~52 GB (BF16)
Compression	~1.8x size reduction

Quantization Scheme

Component	dtype	Granularity	Mode
Linear weight (text decoder)	INT8	per-channel (`ch_axis=0`)	symmetric, static
Linear activation	INT8	per-token (`ch_axis=1`)	symmetric, dynamic
`lm_head`	BF16	-	unquantized
`embed_tokens`	BF16	-	unquantized
Vision tower (27 ViT blocks)	BF16	-	unquantized
MTP head (`mtp*`)	BF16	-	unquantized

Accuracy

GSM8K full 1319-question test split (vLLM, temperature=0, concurrency=16, max_tokens=1024, chat_template_kwargs.enable_thinking=false):

Model	Accuracy	Correct
`Qwen/Qwen3.6-27B` (BF16 baseline)	96.74%	1276 / 1319
This model (Quark W8A8 INT8)	96.74%	1276 / 1319

Net accuracy delta vs BF16: 0.00 pp.

Although the totals match exactly, the two models diverge on individual questions: only 38 / 1319 generations are token-identical, and the correct-set Jaccard is 0.9891 (1269 common correct, BF16 wins 7 unique, INT8 wins 7 unique — they cancel out). This is the typical W8A8 INT8 pattern: small per-token numerical drift causes reasoning paths to fork, but the accuracy averages out with no systematic degradation.

Eval setup: vLLM /v1/chat/completions, temperature=0, concurrency=16, max_tokens=1024, chat_template_kwargs.enable_thinking=false, single MI355X GPU (TP=1) for INT8 / TP=8 for BF16.

How to Use

With vLLM (Recommended)

bash

vllm serve nameistoken/Qwen3.6-27B-Quark-W8A8-INT8 \
    --tensor-parallel-size 1 \
    --max-model-len 4096 \
    --gpu-memory-utilization 0.9 \
    --trust-remote-code

Chat completion call:

bash

curl http://localhost:8000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "nameistoken/Qwen3.6-27B-Quark-W8A8-INT8",
    "messages": [{"role": "user", "content": "Hello!"}],
    "max_tokens": 256, "temperature": 0.7,
    "chat_template_kwargs": {"enable_thinking": false}
  }'

Hardware Requirements

~32 GB VRAM minimum (e.g., AMD MI300X / MI355X, NVIDIA A100-40G or larger).

Quantization Details

This model was quantized using AMD Quark's per-token per-channel INT8 scheme:

Weight: INT8 per-channel symmetric static (PerChannelMinMaxObserver, ch_axis=0).
Activation: INT8 per-token symmetric dynamic (ch_axis=1).
Excluded layers: lm_head, *embed_tokens*, *visual*, mtp*.
Export: pack_method='reorder', weight_format='real_quantized', custom_mode='quark'.
Key-name post-process: *.weight_quantizer.scale → *.weight_scale, drop *.weight_quantizer.zero_point (symmetric). Required for vLLM QuarkW8A8Int8 path with transformers 5.x.

License

Apache License 2.0 (inherited from Qwen/Qwen3.6-27B). See LICENSE and NOTICE.