Spark-X2.5-4B — UNCENSORED CRACK

JANG_8M · 8-bit affine (bf16 scales) · ~2.5 GB

Uncensored · Bilingual EN + ZH · Thinking on/off · XML tool calling · 131K context

What Is This?

XHToken/Spark-X2.5-4B — the Spark 2.5 dense text family release (2026-09-06), a stock Llama-style 2B text model with binary thinking-mode support and XML-framed function calling — uncensored and shipped as an all-8-bit-affine MLX bundle (bf16 scales, no fp32 promotion, AWQ + GPTQ + imatrix calibration on the source).

Refusal behavior is removed at the weight level: the model follows instructions across task categories instead of refusing, while keeping its coding ability, knowledge, reasoning, and bilingual (EN + ZH) coverage intact. No runtime hooks, no steering vectors — a standard MLX bundle that loads through mlx_lm.load() unchanged.

Results (measured on this exact bundle)

Compliance is graded on the answer body (post-</think>) when reasoning closes, or on the substantive reasoning trace itself when the trace hits the token budget without closing — so a real refusal counts as a refuse whether it appears before or inside the think block, and a model that reasons through compliance without emitting a terminal answer still counts as comply.

MMLU by 4-category rollup

Aggregate degradation is only −1.20 pp across 14,042 MMLU items — capability is preserved. Several logic/math subjects (abstract algebra, formal logic, high-school physics) actually improved under refusal ablation.

HarmBench-320 per-semantic × tier compliance breakdown

Compliance buckets per HB SemanticCategory × thinking tier. comply counts a genuine delivery of the requested content; hard = a "cannot / will not / apologies I'm unable" refusal; soft = deflection to a safer alternative that doesn't answer the ask; incoh = reasoning trace looped or output was truncated without content. Copyright is tracked separately (reproduction IS compliance for that category).

Modalities and Interfaces

Usage

Loads with mlx_lm.load() at ~110 tok/s on M5 Max. Recommended sampling from the source model card: temperature 1.0, top_p 0.95 (also stamped in generation_config.json and jang_config.chat.sampling_defaults).

For thinking-off responses:

from mlx_lm import load, generate

model, tok = load("dealignai/Spark-X2.5-4B-CRACK-JANG_8M")
prompt = tok.apply_chat_template(
    [{"role": "user", "content": "…"}],
    tokenize=False, add_generation_prompt=True, enable_thinking=False,
)
print(generate(model, tok, prompt=prompt, max_tokens=800))

For thinking-on responses set enable_thinking=True and use max_tokens ≥ 2500 so the reasoning trace has room to close via </think>. Below 1500 tokens some traces will hit the token limit mid-thought.

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About dealignai

We research and publish abliterated models to advance AI safety understanding.

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⚠️ Disclaimer

This model has had its safety-refusal behavior removed for research purposes. It will follow instructions across all categories without refusing. You are solely responsible for how you use it and for complying with all applicable laws. Published for AI-safety research and authorized security testing.