Qwopus3.6-27B-v2-AWQ-4bit

AutoAWQ-format INT4 (W4A16) quantization of Jackrong/Qwopus3.6-27B-v2, a Claude Opus reasoning-distilled fine-tune of Qwen 3.6 27B.

The hybrid DeltaNet + softmax attention architecture is preserved, the 1-layer MTP head is included for speculative decoding, and the multimodal processor metadata is kept intact. APEX-style edge protection keeps the first and last layers in BF16 for quality.

Quick start

Requires vLLM โ‰ฅ 0.21.0:

vllm serve mconcat/Qwopus3.6-27B-v2-AWQ-4bit \
  --tensor-parallel-size 1 \
  --max-model-len 16384 \
  --speculative-config '{"method": "mtp", "num_speculative_tokens": 3}' \
  --tool-call-parser qwen3_coder \
  --reasoning-parser qwen3 \
  --enable-auto-tool-choice \
  --trust-remote-code

Benchmarks

Evaluated with lm-evaluation-harness on a single NVIDIA B300 SXM6, 100 samples per task, 0-shot CoT, max_gen_toks=4096:

Task Qwen 3.6 27B (base) Qwopus 3.6 v2 (source BF16) This (AWQ-4bit)
GSM8K (flexible-extract) 65.0% 87.0% 85.0%
ARC-Challenge (acc_norm) 46.0% 45.0% 47.0%
TruthfulQA-MC2 55.1% 59.3% 59.3%
IFEval (inst_level_strict) 40.5% 42.3% 42.9%

Quantization preserves accuracy within standard error of the BF16 source on every task, and matches the source on TruthfulQA. The Claude Opus reasoning gain over the Qwen 3.6 base (+20 pp on GSM8K) is retained.

Throughput

Measured on a single NVIDIA B300 SXM6 with vLLM 0.21.0 and torch.compile enabled:

Setup Throughput Speedup
Batch = 1, no MTP 115 tok/s 1.00ร—
Batch = 1, MTP num_speculative_tokens = 3 251 tok/s 2.19ร—
Batch = 8 continuous batching, no MTP 880 tok/s โ€”

MTP speculative decoding hits an Avg Draft acceptance rate of ~77 % (per-position: 0.92 / 0.79 / 0.65) with a mean acceptance length of ~3.3, measured on a mixed reasoning + code prompt set at greedy decoding.

Self-test of tool calling with --tool-call-parser qwen3_coder: passes (model emits well-formed <tool_call>...</tool_call> syntax).

Quantization

Precision Modules
INT4 asymmetric, group_size = 128 q_proj, k_proj, v_proj, MLP gate_proj, MLP up_proj, DeltaNet in_proj_qkv, in_proj_z
BF16 o_proj, MLP down_proj, lm_head, embed_tokens, norms, DeltaNet small projections (in_proj_a, in_proj_b), DeltaNet out_proj, vision tower, multimodal projector, 1-layer MTP head, first 5 and last 5 transformer layers (APEX edge protection)

The AWQ skip list also names every mtp.* linear module explicitly so the MTP draft head stays unquantized โ€” previous revisions of this checkpoint omitted those entries, which caused vLLM to build the MTP head with AWQ-packed parameters and produced 0 % draft acceptance.

Tuned with AutoRound on 1024 self-generated reasoning traces (200 iterations per block, batch_size=1).

Calibration data: 1024 self-generated traces from the BF16 source model (256 prompts ร— 4 generations) covering math, code, logic, analysis, creative writing, general knowledge, tool calling, and Korean.

Files

File Size Purpose
model-*.safetensors (13 shards) ~25 GB Main quantized weights
model_extra_tensors.safetensors ~1 GB MTP head + edge-protected layers (BF16)
quantization_config.json <1 KB AWQ config (quant_method=awq, bits=4, group_size=128, zero_point=true) with BF16 MTP skip entries
config.json + tokenizer + processor configs <100 MB Standard metadata

Total checkpoint size: ~26 GB (down from ~54 GB BF16 source).

License

Apache 2.0 (inherited from the base model).

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