Qwen3.6-27B-Claude-Opus-Reasoning-Distill-v2-abliterated-OptiQ-3.7bpw-mlx

THIS IS A TEXT-ONLY MODEL — NO VISION

The upstream abliteration pass stripped the vision tower. For vision-capable Qwen 3.6 27B Opus-Distill MLX quants, see our parallel repos at huggingface.co/lemuralabs (look for repos without -abliterated in the name).

OptiQ static mixed ~3.7 BPW MLX quantization of an abliterated Qwen 3.6 27B Claude-Opus reasoning distill, by the Lemura Labs team.

The smallest of our line. Uses mlx-optiq sensitivity scans (forward-only KL divergence) to assign 2-bit to layers that tolerate it and 4-6-bit to the layers that don't, averaging ~3.7 bits per weight. Best size/quality ratio for tight RAM budgets.

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TL;DR

Disk size	~12 GB
Effective BPW	3.7
Scheme	OptiQ static-mixed (sensitivity-ranked, KL-driven assignment)
Recommended RAM	16 GB Apple Silicon (M1/M2/M3/M4 Air, mini, base Pro)
Vision	No — text-only (the upstream abliteration step stripped the ViT)
Made by	Lemura Labs

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Lineage

Qwen/Qwen3.6-27B (Qwen Team — base pretrain)
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TeichAI/Qwen3.6-27B-Claude-Opus-Reasoning-Distill-v2 (TeichAI — Claude-Opus reasoning distill)
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abliterated (refusal-ablated) via OBLITERATUS v0.1.2 (multi-direction SVD, BF16)
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this repo — OptiQ static mixed ~3.7 BPW, MLX format (Lemura Labs team — quantization)

Direct upstream links:

• Foundation: Qwen/Qwen3.6-27B
• Reasoning distill: TeichAI/Qwen3.6-27B-Claude-Opus-Reasoning-Distill-v2
• Abliteration tool: OBLITERATUS (multi-direction SVD, 6 directions, 3 refinement passes, λ=0.08)
• Quantization tool: mlx-lm + mlx-optiq for OptiQ variants

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Use it

mlx-lm (recommended)

pip install mlx-lm

from mlx_lm import load, generate

model, tokenizer = load("lemuralabs/Qwen3.6-27B-Claude-Opus-Reasoning-Distill-v2-abliterated-OptiQ-3.7bpw-mlx")
prompt = "Explain the difference between SSM and softmax attention in three sentences."
out = generate(model, tokenizer, prompt=prompt, max_tokens=400)
print(out)

Chat template

messages = [
 {"role": "system", "content": "You are a helpful, candid reasoning assistant."},
 {"role": "user", "content": "Plan a 3-day Tokyo itinerary for a foodie."},
]
prompt = tokenizer.apply_chat_template(messages, add_generation_prompt=True, tokenize=False)
print(generate(model, tokenizer, prompt=prompt, max_tokens=600))

CLI

mlx_lm.generate --model lemuralabs/Qwen3.6-27B-Claude-Opus-Reasoning-Distill-v2-abliterated-OptiQ-3.7bpw-mlx --prompt "Hello" --max-tokens 256

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Quantization details

• Source weights: BF16 abliterated checkpoint (28 shards, ~57 GB) derived from TeichAI/Qwen3.6-27B-Claude-Opus-Reasoning-Distill-v2 via OBLITERATUS multi-direction SVD ablation (preserves coherence; KL drift = 0.149 from base).
• Quantization scheme: OptiQ static-mixed (sensitivity-ranked, KL-driven assignment).
• Group size: 64.
• Calibration corpus: mlx-lm calibration_v5 (~427 KB English text, used for OptiQ sensitivity ranking; uniform/affine variants do not require calibration).
• Sanity check: forward perplexity on held-out calibration text within 1–3% of next-higher-precision sibling.

Architecture notes

The Qwen 3.6 27B family uses a hybrid attention stack — 4 GatedDeltaNet (linear-attention/SSM) layers followed by 1 full-softmax-attention layer, repeated 16× for 64 total layers, 5120 hidden, 248K vocab, 262K context. The SSM kernels lack a VJP path in MLX, so backward-pass-based quant methods (DWQ, dynamic quant) cannot be applied here — OptiQ's forward-only sensitivity approach is the only calibration-aware option that works on this architecture. That's why the OptiQ variants exist.

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Behavior caveats

• Text-only — no vision. The abliteration pipeline (OBLITERATUS) ran on the LM tower and stripped the ViT. For vision-capable quants of the same Opus-Distill v2 lineage, use our parallel non-abliterated repos at huggingface.co/lemuralabs (any repo without -abliterated in the name).
• This is an abliterated model — refusal directions were surgically removed from the parent. It will answer prompts the parent would refuse. Use responsibly and within applicable law.
• Quantization preserves abliteration: the refusal rate measured at BF16 (~35% from a 100% baseline) stays in that range across our quants.

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Credits

Quantization & release	Lemura Labs
Reasoning distill	TeichAI (Claude-Opus 4.5/4.6 high-reasoning datasets)
Foundation model	Qwen Team
Abliteration toolkit	OBLITERATUS by elder-plinius
Quant toolkit	mlx-lm, mlx-optiq

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License

Apache-2.0, inherited from the foundation and distill upstream.

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