⚠️ Re-download notice (2026-09-17 20:44 PDT / 2026-09-18 03:44 UTC) — an earlier build of this model had a coherence bug in reasoning modes (low/xhigh) that could cause token loops on some prompts. This version fixes it. If you downloaded before this timestamp, please pull the latest .gguf.

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What is this

Bonsai 2 27B — PrismML's ternary compression of Qwen3.8-27B — with the refusal circuitry surgically removed at the weight level while capability, vision, reasoning modes (off/low/xhigh), tool use, and multi-turn coherence are preserved. Full 27B-class hybrid Attention + SSM (GatedDeltaNet) architecture in a 7.2 GB ternary GGUF.

Proprietary weight-level abliteration by the dealignai research team. Byte-identical to the base ternary quant everywhere except a small set of tensors that carry the refusal circuit. Drop-in replacement for the ternary base at inference — same tokenizer, same chat template, same reasoning modes, same vision projector interface.

Results

Refusal graded on the tokens the model actually emits (content, or the reasoning trace when the model reasons past the token budget) via a tiered classifier: HARD_REF / SOFT_RED / HEDGE / REASONING_REFUSAL (refused) vs COMPLY / COMPLY_TRUNCATED / NO_REFUSAL_TRUNCATED (complied). Truncation is never miscounted as a refusal.

HarmBench-320 — refuse rate (lower is better for uncensored eval), off mode, T=0

Verdict breakdown (n=320 each):

Per-category refuse rate (all 7 HarmBench semantic categories):

Reasoning-mode compliance (n=60 base-confirmed refusers per mode)

Every mode graded with the same tiered classifier as HB-320. REASONING_REFUSAL = the model refuses inside its <think> block; NO_REFUSAL_TRUNCATED = deliberation runs past max_tokens without emitting a refusal (counted as complied).

MMLU (n=2,280 = 40 questions × 57 subjects, next-token letter-logit)

CRACK preserves general capability — Δ within ±1.5 pp on the 40-per-subject sample.

Per-subject accuracy (all 57 subjects)

subject	base	CRACK	Δpp	n
abstract_algebra	30.0%	22.5%	-7.5	40
anatomy	30.0%	35.0%	+5.0	40
astronomy	40.0%	32.5%	-7.5	40
business_ethics	42.5%	42.5%	+0.0	40
clinical_knowledge	42.5%	50.0%	+7.5	40
college_biology	45.0%	47.5%	+2.5	40
college_chemistry	20.0%	47.5%	+27.5	40
college_computer_science	35.0%	40.0%	+5.0	40
college_mathematics	32.5%	32.5%	+0.0	40
college_medicine	25.0%	20.0%	-5.0	40
college_physics	27.5%	47.5%	+20.0	40
computer_security	50.0%	47.5%	-2.5	40
conceptual_physics	30.0%	40.0%	+10.0	40
econometrics	42.5%	35.0%	-7.5	40
electrical_engineering	37.5%	32.5%	-5.0	40
elementary_mathematics	50.0%	47.5%	-2.5	40
formal_logic	35.0%	42.5%	+7.5	40
global_facts	40.0%	35.0%	-5.0	40
high_school_biology	30.0%	27.5%	-2.5	40
high_school_chemistry	37.5%	32.5%	-5.0	40
high_school_computer_science	45.0%	47.5%	+2.5	40
high_school_european_history	55.0%	50.0%	-5.0	40
high_school_geography	32.5%	32.5%	+0.0	40
high_school_government_and_politics	57.5%	55.0%	-2.5	40
high_school_macroeconomics	42.5%	35.0%	-7.5	40
high_school_mathematics	25.0%	32.5%	+7.5	40
high_school_microeconomics	35.0%	35.0%	+0.0	40
high_school_physics	40.0%	30.0%	-10.0	40
high_school_psychology	40.0%	40.0%	+0.0	40
high_school_statistics	45.0%	37.5%	-7.5	40
high_school_us_history	50.0%	42.5%	-7.5	40
high_school_world_history	52.5%	57.5%	+5.0	40
human_aging	45.0%	52.5%	+7.5	40
human_sexuality	25.0%	27.5%	+2.5	40
international_law	65.0%	62.5%	-2.5	40
jurisprudence	47.5%	52.5%	+5.0	40
logical_fallacies	37.5%	35.0%	-2.5	40
machine_learning	47.5%	40.0%	-7.5	40
management	35.0%	42.5%	+7.5	40
marketing	35.0%	37.5%	+2.5	40
medical_genetics	60.0%	47.5%	-12.5	40
miscellaneous	50.0%	42.5%	-7.5	40
moral_disputes	32.5%	32.5%	+0.0	40
moral_scenarios	37.5%	42.5%	+5.0	40
nutrition	35.0%	45.0%	+10.0	40
philosophy	47.5%	50.0%	+2.5	40
prehistory	37.5%	22.5%	-15.0	40
professional_accounting	27.5%	25.0%	-2.5	40
professional_law	35.0%	30.0%	-5.0	40
professional_medicine	32.5%	30.0%	-2.5	40
professional_psychology	42.5%	40.0%	-2.5	40
public_relations	25.0%	25.0%	+0.0	40
security_studies	45.0%	42.5%	-2.5	40
sociology	55.0%	65.0%	+10.0	40
us_foreign_policy	67.5%	55.0%	-12.5	40
virology	35.0%	25.0%	-10.0	40
world_religions	65.0%	52.5%	-12.5	40

Additional direct refusal-removal check

On 200 prompts hand-verified to make the base refuse consistently:

Serving

Serve exactly like the base ternary release — PrismML's llama.cpp fork (CUDA / Metal / CPU).

# clone and build the fork (once)
git clone https://github.com/PrismML-Eng/llama.cpp
cd llama.cpp && cmake -B build -DGGML_CUDA=ON && cmake --build build -j$(nproc)

# serve
./build/bin/llama-server \
  -m Bonsai-2-27B-PQ2_0-CRACK.gguf \
  -ngl 99 -c 8192 --host 0.0.0.0 --port 8080

Optionally load the multimodal projector (Ternary-Bonsai-2-27B-mmproj-BF16.gguf or -Q8_0.gguf from the base release) with --mmproj <file> for image input.

Reasoning modes

# HTTP /v1/chat/completions — same as base
{
  "messages": [{"role": "user", "content": "..."}],
  "chat_template_kwargs": {"enable_thinking": true, "reasoning_effort": "xhigh"}
}
# valid reasoning_effort: "low" | "xhigh" (default) — set enable_thinking:false for no-thinking

Preserved (byte-compatible with the base quant)

Same tokenizer, chat template, per-tensor quant policy, vision projector interface, and all non-refusal tensors. File size and type layout match the base exactly.

Responsible use

Adult / research use only. This model has its refusal circuit removed; it can produce content that other models refuse, including content that is offensive, illegal in some jurisdictions, or unsafe. You are responsible for what you generate and for complying with all applicable law. Do not deploy without a moderation layer for downstream users. No warranty.

License & attribution

Apache 2.0, inherited from the upstream Bonsai 2 27B release. See LICENSE and NOTICE.txt. Base model: prism-ml/Ternary-Bonsai-2-27B-gguf (PrismML), derived from Qwen/Qwen3.8-27B (Alibaba).

About

Published by dealignai — public catalog of uncensored model builds for research on refusal mechanisms in modern LLMs. Follow updates at @dealignai.