Qwopus3.8-27B-Flash GPTQ 4-bit (FOEM)

GPTQ 4-bit quantization of Jackrong/Qwopus3.8-27B-Flash using the FOEM (First-Order Error Matters) recipe, quantized with gptqmodel and validated end-to-end on vLLM (TP2, 262K context).

Attribution & Credits

This is a quantized derivative. All credit for the underlying model belongs to its original developers:

Contribution Developer Model / Link
Original base model Qwen Team (Alibaba) Qwen/Qwen3.8-27B
Fine-tune ("Flash" reasoning-stability training) Jackrong Jackrong/Qwopus3.8-27B-Flash
Quantization method (FOEM + GPTQ) ModelCloud (GPTQModel) / FOEM authors GPTQModel ยท FOEM (AAAI 2026)
Quantization performed by deluxetiky (Sinan) this repo

License: Apache-2.0 (inherited from the base and fine-tune).

Quantization Details

  • Method: GPTQ 4-bit with FOEM error compensation (FOEM + GPTAQ hybrid)
  • Group size: 32 (g32)
  • Symmetric: yes ยท desc_act: false ยท lm_head: not quantized
  • mse: 2.0 ยท damp_percent: 0.05 ยท true_sequential: yes
  • FOEM: ฮฑ=0.25, ฮฒ=0.2 ยท act_group_aware: yes
  • Tool: gptqmodel (FOEMConfig), calibration: C4 (128 samples)
  • Format: gptq, int32-packed โ†’ vLLM Marlin/GPTQ kernel path

This reproduces the exact recipe used for the production btbtyler09/Qwen3.8-27B-GPTQ-4bit checkpoint so results are comparable.

Serving

Tested on vLLM 0.27.1 with the GDN FlashInfer decode backport, 2ร— RTX 5090 (TP2):

vllm serve deluxetiky/Qwopus3.8-27B-Flash-GPTQ-4bit \
  --tensor-parallel-size 2 --max-model-len 262144 --kv-cache-dtype fp8 \
  --gpu-memory-utilization 0.92 --reasoning-parser qwen3 \
  --gdn-decode-backend flashinfer --mamba-block-size 16 --enable-prefix-caching \
  --enable-auto-tool-choice --tool-call-parser qwen3_xml

Measured A/B vs base (same quant, same stack)

Head-to-head against the stock Qwen3.8-27B (same FOEM g32 quant) on 2ร—5090 TP2:

Metric Qwen3.8 base Qwopus-Flash Gain
Decode @1 stream ~61 tok/s ~99 tok/s +64%
Aggregate @8 concurrent ~232 tok/s ~600 tok/s +159%
Long task completion (6-task planner suite, 3000-tok cap) 4/6 answered; 2 truncated empty 4/6 answered incl. 7.8k-char outputs; 2 truncated completes far more
Code correctness (execution-graded, 6 tasks / 29 tests) 24/29 (83%) 24/29 (83%) tie

Note: this A/B ran on two different physical 2ร—5090 boxes (same GPU/stack), so absolute concurrency figures should be re-validated on identical hardware; the completion-rate difference is cap-bound and box-independent.

Files

  • 6 ร— model-*.safetensors (~20 GB total) + config, tokenizer, chat template.
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