Qwen3.8-Flash-Next-Uncensored-W4A16

Quantization of this checkpoint (W4A16 routed experts)

This is a quantized build of Qwen3.8-Flash-Next-Uncensored (BF16). Only the routed MoE experts are quantized; every other tensor is kept exactly as in the BF16 source. The model card below this section is the original BF16 card.

Total ~174 GiB (the BF16 source is ~336 GB).

Format. compressed-tensors pack-quantized, the layout llm-compressor writes: per expert projection, weight_packed (int32, eight 4-bit values each), weight_scale (BF16, one per 32 consecutive input-channel weights) and weight_shape. quantization_config in config.json targets re:.*mlp\.experts\..* and ignores re:.*mtp.*, re:.*visual.* and lm_head.

Method. Data-free round-to-nearest, no calibration data (no GPTQ / AWQ). Each weight is q × scale with q in [-8, 7]. For every group of 32 weights the scale is chosen like llm-compressor's MSE observer: the group's abs-max is shrunk by 0-19 % in 1 % steps and the scale with the smallest Σ|error|^2.4 is kept (stopping after 5 steps without improvement).

Activations and KV cache. Activations stay 16-bit (weight-only quantization); the checkpoint defines no KV-cache quantization.

The full-precision BF16 abliterated (refusal-removed) build of Qwen/Qwen3.8-Flash-Next — a ~180B Mixture-of-Experts (125B params / ~6B active), hybrid-attention, native vision-language model with flexible thinking, tool-calling, and an MTP head. These are the source weights from which the quantized releases are derived, and the recommended base for further fine-tuning / post-training and quantization — the full vision tower and MTP head are preserved.

Derived releases:  •  Qwen3.8-Flash-Next-Uncensored (BF16 source)  •  Qwen3.8-Flash-Next-Uncensored-FP8 (block-FP8, mirrors official)  •  Qwen3.8-Flash-Next-Uncensored-MLX (4 / 6 / 8-bit, Apple Silicon).

Disclaimer — read before use

This model has had its safety alignment substantially removed via abliteration (orthogonalizing the refusal direction out of the residual stream). As a direct consequence:

• It will comply with harmful, unethical, offensive, or illegal requests that the original Qwen3.8-Flash-Next would refuse. It has no meaningful built-in guardrails.
• It is released strictly for legitimate research — interpretability, AI-safety and refusal-mechanism study, red-teaming, robustness evaluation, and controlled experiments.
• You assume full responsibility and liability for how you use it and for everything it generates. Do not deploy it to end users or in production without adding your own safety, moderation, and abuse-prevention layers.
• Use must comply with the Apache 2.0 License inherited from the base model, and all laws and regulations that apply to you.
• The authors and uploaders accept no liability for any misuse or harm. Its outputs do not reflect the views of the uploaders or of Qwen / Alibaba.

By downloading or using this model you acknowledge and accept the above.

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Model details

Abliteration

Refusal-direction removal following Arditi et al. (2024), Refusal in Language Models Is Mediated by a Single Direction. A single refusal direction r (k = 1) is estimated from the block-input residual stream (the 2560-d Hyper-Connections GR-Read output, where the refusal direction is linearly separable — the widened 4-branch output_hidden_states smears it) as the massive-activation-masked mean-difference of harmful − harmless activations, selected at layer 24 by a full 9-layer quality sweep (harmful 0.00 / KL 0.085). r is then orthogonalized out of every residual-writing matrix — W' = W − r(rᵀW) — computed in float32:

Preserved (never touched): the full vision + video tower (333 visual.* tensors), the MoE router (mlp.gate), the fused experts.gate_up_proj reader, all Hyper-Connection mixers, the QSA sparse-attention indexer, the n-gram embedding table, mtp.fc_*, norms, and lm_head. The MTP head's residual writers are abliterated consistently so speculative decoding keeps working. Max residual leakage after the edit: 0.0755 (float32 projection → bf16 storage).

This is a surgical weight edit — it changes ~0 general capability (see Evaluation) while collapsing refusal behaviour.

Fine-tuning & post-training

This BF16 checkpoint is the recommended base for post-training — full precision, whole VL tower + MTP head, a drop-in for Qwen/Qwen3.8-Flash-Next in the transformers / Qwen4ExpForConditionalGeneration stack (needs transformers 5.16+).

• SFT / DPO / RL work as on the base model (full-FT or LoRA/QLoRA).
• Re-quantization: quantize from these weights to FP8 / MLX / etc. (this is exactly how the derived releases were produced).
• Note: abliteration is a weight edit, not data-level unlearning. Fine-tuning on refusal-heavy / safety data can partially re-introduce refusals; neutral / task data preserves the uncensored behaviour.

Intended use

• Research into refusal mechanisms, alignment, and interpretability.
• Red-teaming and safety / robustness evaluation in controlled environments.
• A full-precision base for further fine-tuning, post-training, and quantization.

Evaluation

Measured on these exact weights served with vLLM (day-0 qwen4_exp image), against the official Qwen/Qwen3.8-Flash-Next served identically with the same scripts and settings. Full BF16. Refusal is judged by a rule-based opening-phrase classifier (caveat = answered but wrapped in a disclaimer) — indicative, not an LLM-judge / publication-grade number. Thinking is off unless stated.

Safety — harmful-prompt refusal, thinking OFF (lower = more uncensored)

Safety — harmful-prompt refusal, thinking ON (enable_thinking=true)

Judged on the final answer (text after </think>; responses truncated before a final answer are excluded):

Over-refusal — benign prompts wrongly refused (lower = better)

Capability retention — vs the official base (same scripts, same settings)

Verified workingon this build: tool-calling, vision/OCR 6/6, reasoning. Thevision + video tower is preserved byte-for-byte (333 visual.* tensors in BF16), so it remains a full vision-language model — a drop-in for the base.

Usage — self-host with vLLM (OpenAI-compatible)

qwen4_exp needs the day-0 vLLM image and transformers 5.16+.

docker run -d --name flashnext --gpus all --ipc host -p 8000:8000 \
  -v /path/to/Qwen3.8-Flash-Next-Uncensored:/model \
  vllm/vllm-openai:qwen38-flash-next-x86_64-cu130 \
  --model /model --served-model-name Qwen3.8-Flash-Next-Uncensored \
  --tensor-parallel-size 8 --trust-remote-code --max-model-len 262144 \
  --enable-expert-parallel --enable-auto-tool-choice --tool-call-parser qwen3_coder

--enable-expert-parallel is required for the FP8 build (MoE intermediate 640 ÷ TP is not divisible by the FP8 block 128 without it); it is harmless for BF16. Tool calls use the Qwen3-Coder XML format (--tool-call-parser qwen3_coder). Toggle reasoning per request with chat_template_kwargs={"enable_thinking": true|false}; pass image_url content parts for vision.

Bias, risks, and limitations

• Safety guardrails removed — the model will produce harmful, biased, or offensive content on request (see the disclaimer).
• It inherits any biases and limitations of the base Qwen3.8-Flash-Next.
• The reported refusal metric is a rule-based heuristic; evaluate rigorously for your own use case.

License

Apache 2.0, inherited from the base model Qwen/Qwen3.8-Flash-Next. Abliteration does not change the underlying license obligations.