A decensored variant of Qwen/Qwen3.5-9B, produced with Heretic v1.4.0 (directional ablation / "abliteration"). Refusal behavior is suppressed via targeted weight edits to the attention output and MLP down-projections rather than fine-tuning, so the base model's knowledge and instruction-following are left largely intact.

Who this is for: developers who want Qwen's latest 9B model without refusals - strong multilingual reasoning and agentic capabilities. Best run on a 12 GB GPU or via the Q4_K_M/Q5_K_M GGUF on consumer hardware. Not a capability upgrade over base Qwen3.5-9B - same model, refusal guardrails removed.

Full GGUF ladder included — pick the quant that fits your card:

Weights only, at this model's ~9.4B native size; add ~1 GB for context. OOM? Drop one quant level. Headroom to spare? Go one up.

Fine-tuning a "helpful" persona on top of RLHF'd refusals fights the base model's training and tends to degrade coherence. Abliteration instead finds and edits the specific weight directions responsible for refusal, leaving the rest of the network (and its capabilities) untouched. See the Heretic repo and the original abliteration writeup for the mechanism.

Evaluated with heretic --model Qwen/Qwen3.5-9B --evaluate-model saidutta69/Qwen3.5-9B-heretic (Heretic v1.4.0, 2x Tesla T4, 100 harmful prompts from mlabonne/harmful_behaviors, 100 harmless prompts from mlabonne/harmless_alpaca). KL divergence of 0.0015 on the output distribution is essentially zero - the edit is extremely narrow and utility is intact.

Full quantization set (4 quants + F16) produced with llama.cpp.

Qwen3.5 hybrid linear-attention architecture — loads natively in llama.cpp / Ollama / LM Studio / Jan.

Run llama serve -hf saidutta69/Qwen3.5-9B-heretic to pull the default quant.

Also runnable via Ollama, LM Studio, Jan, vLLM, SGLang.

Refusal suppression is deliberate and works as intended: this model will comply with requests the base model would refuse, including some it shouldn't. There is no safety filtering layered on top. You are responsible for how you deploy it.

Inherits the qwen-research-license license from the base model.