RQ-27B-CODER-AAbliterated
Qwopus3.6-27B-Coder abliterated Β· NVFP4
27B 256K agentic coder Β· tool-calling Β· refusals removed (2-round Heretic).
Params27B
Active27B (dense)
Size18 GB
Perplexity6.73
Refusals99 β†’ 3 / 100
Context256K
MTP headbf16

TL;DR: Qwopus3.6-27B-Coder abliterated, quantized to NVFP4 (W4A4) for vLLM on NVIDIA Blackwell. 18 GB, wikitext-2 PPL 6.73, 256K agentic coder, refusals removed (2-round Heretic).

Qwopus3.6-27B-Coder abliterated NVFP4

Jackrong/Qwopus3.6-27B-Coder, abliterated (refusal direction removed) with Heretic in two iterative rounds, then quantized to NVFP4 (W4A4) in the compressed-tensors nvfp4-pack-quantized format with llm-compressor (GPTQ + MSE, shared fused-layer scales).

Near-lossless and decensored. Two Heretic rounds cut refusals from 99/100 to 3/100 of held-out harmful prompts while keeping a KL divergence of 0.0398 to the original model (well under the 0.5 line that signals capability damage). NVFP4 then compresses to ~18 GB with a wikitext-2 perplexity of 6.73.

  • Built for vLLM on NVIDIA Blackwell (4-bit weight + 4-bit activation). Pre-Blackwell GPUs run it weight-only.
  • Loading and generation verified in vLLM on an NVIDIA GB10 (Blackwell, sm_121).

Uncensored / abliterated model. It follows instructions without refusal guardrails. The abliteration only removes refusals; all other behaviour comes from the base model. You are responsible for how you use it.

Fidelity

Near-lossless versus the bf16 source, 18 GB vs 55.6 GB bf16 (~33%), at wikitext-2 perplexity 6.73 and KL divergence 0.0398 to the original. GPTQ error compensation and an MSE observer keep the drop from bf16 minimal; the header lists the full characteristics and Quantization covers the recipe.

Quickstart

NVFP4 is auto-detected from config.json (compressed-tensors); no quantization flag needed. --reasoning-parser qwen3 splits the <think> block into reasoning_content; --tool-call-parser qwen3_coder enables tool/function calling for agentic coding.

vllm serve maci0/Qwopus3.6-27B-Coder-abliterated-NVFP4 \
  --served-model-name qwopus-27b-coder-abliterated-nvfp4 \
  --max-model-len 131072 \
  --gpu-memory-utilization 0.90 \
  --kv-cache-dtype fp8 \
  --reasoning-parser qwen3 \
  --enable-auto-tool-choice --tool-call-parser qwen3_coder
  • Supports up to 262144 tokens; keep at least 128K to preserve thinking quality. --max-model-len 131072 is a safe default; raise it if memory allows.
  • Add --language-model-only to skip the vision tower and free KV cache for text use.
  • The parser flags are not auto-detected; pass them explicitly.

Python (OpenAI client)

from openai import OpenAI
client = OpenAI(base_url="http://localhost:8000/v1", api_key="x")
r = client.chat.completions.create(
    model="qwopus-27b-coder-abliterated-nvfp4",
    messages=[{"role": "user", "content": "Write a Python function that merges two sorted lists."}],
)
print(r.choices[0].message.content)

curl

curl http://localhost:8000/v1/chat/completions -H "Content-Type: application/json" -d '{
  "model": "qwopus-27b-coder-abliterated-nvfp4",
  "messages": [{"role": "user", "content": "Write a Python function that merges two sorted lists."}]
}'

About the base model

A 27B Qwen3.5-family vision-language model specialized for code (Qwopus 3.6 Coder), with thinking-mode reasoning and a 256K context window.

  • 64 decoder layers: hybrid gated delta-net linear attention plus full attention, dense MLP, plus a vision tower for image and video input.
  • 256K context (max_position_embeddings 262144).
  • Thinking mode by default, with an instruct toggle.

Abliteration

Heretic removes the refusal direction with a TPE-optimized search over per-component ablation strength, jointly minimizing refusal rate and KL divergence from the original model, then merges the best trial. This model was abliterated in two iterative rounds: round 1 removed the dominant refusal direction, then Heretic was re-run on the round-1 model to remove the residual refusal direction that surfaced once the first was gone. Because Qwopus is a thinking model, evaluation ran in non-thinking mode so each judged response is a real answer rather than an unfinished <think> block; the shipped model restores the original thinking chat template.

Round Refusals Note
Baseline 99/100 original model
Round 1 25/100 dominant refusal direction removed
Round 2 3/100 residual direction removed (final)
  • Datasets: mlabonne/harmless_alpaca (good) vs mlabonne/harmful_behaviors (bad).
  • Final KL divergence 0.0398 (capability preserved, well under the 0.5 damage line).

Quantization

Scheme NVFP4, W4A4
Weight rounding GPTQ (Hessian-based error compensation), MSE observer
Weights FP4 (E2M1), group_size=16, tensor_group, FP8 (E4M3) group scales, shared across fused layers
Activations FP4, dynamic per-group, FP8 (E4M3) scales
Quantized all language-model Linear layers
Kept in bf16 vision tower (model.visual.*), lm_head, MTP head
Untouched gated delta-net Conv1d and SSM params (A_log, dt_bias), never Linear

GPTQ is a quantization-time cost only; inference speed and format are identical to plain round-to-nearest NVFP4, but it chooses better 4-bit values.

Calibration: 512 domain-matched samples (long reasoning + general chat + code), max_seq_len=2048, text-only path through the VL model.

Recommended sampling

Thinking mode is the default.

  • Thinking, precise coding: temperature=0.6, top_p=0.95, top_k=20
  • Thinking, general: temperature=1.0, top_p=0.95, top_k=20
  • Instruct / non-thinking: temperature=0.7, top_p=0.80, top_k=20
  • To run non-thinking, set {%- set enable_thinking = false %} in the chat template, or pass extra_body={"chat_template_kwargs": {"enable_thinking": false}}.

Related

Notes

  • Needs NVIDIA Blackwell (sm_121, e.g. GB10) for accelerated W4A4; pre-Blackwell GPUs run it weight-only.
  • --reasoning-parser and --tool-call-parser are not auto-detected; pass them explicitly.
  • Thinking mode is on by default; toggle it via the chat template or chat_template_kwargs.
  • No refusal guardrails; you are responsible for how you use it.

License

Apache-2.0, following the base model. Intended use and all responsibility for use follow the base model.

Credits

Part of Rogue Quants Β· NVFP4 component datasheets Β· collection. Fabricated on GB10 (Blackwell) with llm-compressor. Refusals shown per 100 harmful prompts; "n/a" = not separately measured (base-inherited).
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