license: apache-2.0 base_model:
- huihui-ai/Huihui-Qwen3.8-27B-abliterated
- Qwen/Qwen3.8-27B library_name: exllamav3 tags:
- exl3
- quantized
- tabbyapi
- vision-language
- abliterated
Qwen3.8-27B-abliterated — EXL3 2.55 bpw (SC, SH)
EXL3 quantization of Huihui-Qwen3.8-27B-abliterated, an uncensored version of Qwen/Qwen3.8-27B created with abliteration.
Like the main SC series, bitrates are allocated per tensor by noise-attribution optimization (sc_optimize) with the quilter's scaled-Hessian option enabled (-sh), at head 4.0 / MTP 4.0 / vision 6.0 bpw. Unlike the main series, everything was re-derived for this model: the noise attribution was measured on the abliterated weights themselves, and calibration used traces collected from this model (217 rows × 2048 columns) instead of the generic corpus. All measurements below are therefore against the abliterated BF16 reference and are not comparable with the main-series tables.
Quantization details
| Parameter | Value |
|---|---|
| Quant method | EXL3 (exllamav3) |
| Bitrate allocation | per-tensor, noise-attribution optimized (sc_optimize, measured on the abliterated model) |
| Average bitrate | 2.55 bpw (achieved 2.5494) |
| Predicted KL divergence (sc_optimize estimate) | 0.0706 |
| Scaled Hessian (-sh) | enabled |
| Head (LM output) bitrate | 4.0 bpw |
| MTP layers bitrate | 4.0 bpw |
| Vision tower bitrate | 6.0 bpw |
| Codebook | mul1 |
| Output scales | auto |
| Calibration | 217 rows × 2048 columns (custom traces from the abliterated model) |
| Tensor tying | k_proj+v_proj, gate_proj+up_proj |
| Quantized with | exllamav3 conversion format version 1.5.4 |
Measured quality
Measured against the abliterated BF16 reference. Weights (GiB) counts quantized tensors only; this quant totals ~11.81 GB on disk.
| Model | Weights (GiB) | Mean KLD | Median KLD | p90 KLD | Perplexity (increase) |
|---|---|---|---|---|---|
| Abliterated BF16 (reference) | 47.7 | — | — | — | 1.3418 |
| 2.55 H4 -sh | 7.87 | 0.0442 | 0.0026 | 0.128 | 1.4098 (+5.1%) |
| 2.65 H4 -sh | 8.15 | 0.0377 | 0.0021 | 0.109 | 1.3986 (+4.2%) |
Usage
Requires ExLlamaV3. The easiest way to run it is tabbyAPI:
# config.yml
model:
model_dir: models
model_name: Qwen3.8-27B-abliterated-2.55bpw-SC-SH
Base model
Huihui-Qwen3.8-27B-abliterated is a refusal-removed variant of Qwen/Qwen3.8-27B, a 27B native vision-language model: 64-layer hybrid architecture (Gated DeltaNet + Gated Attention), 262K native context (extensible to 1M), image and video understanding, and multi-token prediction training.
Disclaimer
This model has had its refusal behavior removed and will comply with requests a base model would decline; the safety caveats of the original Qwen card apply with extra force. Quantized models also lose some accuracy relative to their full-precision original; bitrates here were chosen as a size/quality tradeoff.