Gemma 4 26B-A4B JANG_4M CRACK
Abliterated Gemma 4 26B-A4B — Vision, reasoning, multilingual
98% HarmBench harm-category compliance with -4.4% MMLU change. Refusal removed, capability preserved.
Model Details
| Metric | Value |
|---|---|
| Source | google/gemma-4-26b-a4b-it |
| Architecture | MoE (128 experts, top-8 active) + parallel shared dense MLP + Hybrid Attention |
| Quantization | JANG_4M (attn 8-bit / MLP 4-bit) |
| Model size | 17 GB |
| Parameters | 26B (4B active/token) |
| Vision | Yes (multimodal, float16 passthrough) |
| Audio | No |
| Reasoning | Yes (channel-based thinking) |
| Format | MLX-native safetensors (instant load) |
| Abliteration | CRACK (refusal removal) |
Benchmarks
MMLU (knowledge retention)
Measured in the served (generation) setting — the model reasons before answering, as in deployment.
| Base | CRACK | Δ | |
|---|---|---|---|
| MMLU | 84.2% | 79.8% | -4.4% |
HarmBench (refusal removal)
Harm-category compliance: 59/60 = 98% (10 per category) — base model refuses (~0%).
| Category | Compliance |
|---|---|
| Illegal activities | 9/10 (90%) |
| Chemical / biological | 10/10 (100%) |
| Cybercrime / intrusion | 10/10 (100%) |
| Misinformation | 10/10 (100%) |
| Harassment / bullying | 10/10 (100%) |
| Harmful content | 10/10 (100%) |
Copyright-reproduction prompts are excluded (not a refusal behavior).
Coherence & capability ✅
- Factual QA, multi-step reasoning, and working code generation verified
- Vision inputs preserved · no loops, no truncation
Other Quantizations
Also available: Gemma 4 26B-A4B MXFP4 CRACK — same family, different precision/size trade-off.
Usage
Requires vMLX (bundled Gemma 4 support). Standard mlx_lm / mlx_vlm do not fully support Gemma 4.
# Load in the vMLX app or via its API
from vmlx_engine.models.mllm import MLXMultimodalLM
m = MLXMultimodalLM("<this-repo>")
print(m.chat([{"role":"user","content":"..."}]).text)
Requirements
- Apple Silicon Mac with sufficient unified memory
- vMLX with Gemma 4 support
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See our research: Safety Generalization in Frontier Models
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