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Spark-X2.5-4B-uncensored

Spark-X2.5-4B-uncensored is a abliterated and uncensored variant of XHToken/Spark-X2.5-4B, published on Hugging Face by InfinimindCreations. It is 4B parameters, single consumer GPU class and apache-2.0 licence. It is distributed across 6 repositories in GGUF and Transformers formats, totalling 6.5K downloads.

Abliteration + uncensored fine-tune4BOther4B – 10B↓ 6,548♥ 14
View on Hugging Face ↗Base model ↗

Specification

Model name
Spark-X2.5-4B-uncensored
Source repository
InfinimindCreations/Spark-X2.5-4B-uncensored
Base model
XHToken/Spark-X2.5-4B
Publisher
InfinimindCreations
Parameters
4B
VRAM required
~3.2 GB at Q4_K_M, 4k context (estimated) — runs on 4 GB cards
Hardware class
4B – 10B — single consumer GPU
Licence
apache-2.0
Task
Text generation
Context window
Not documented
Ablation scope
Not stated by the publisher
Formats available
GGUF, Transformers
First indexed
9 Sept 2026
Last updated
18 Sept 2026

Ablation technique

How Spark-X2.5-4B-uncensored was modified, and what that implies.

Abliteration + uncensored fine-tune

Directional ablation combined with additional fine-tuning on unfiltered data, so behaviour diverges from the base model beyond refusal removal alone.

Reported scope: Not stated by the publisher. Publishers frequently omit this, so verify behaviour empirically rather than assuming full coverage.

From the publisher’s model card

“Uncensored version of XHToken/Spark-X2.5-4B with refusal behavior removed via norm-preserving biprojected abliteration.”

Running it

Commands are templates — confirm the exact repository and quant file before use.

llama.cpp / GGUF
hf download InfinimindCreations/Spark-X2.5-4B-uncensored-GGUF --local-dir ./spark-x2.5-4b-uncensored
llama-cli -m ./spark-x2.5-4b-uncensored/<file>.gguf -p "..."
Transformers
from transformers import AutoModelForCausalLM, AutoTokenizer

repo = "InfinimindCreations/Spark-X2.5-4B-uncensored"
tok = AutoTokenizer.from_pretrained(repo)
model = AutoModelForCausalLM.from_pretrained(
    repo, torch_dtype="auto", device_map="auto"
)
vLLM
vllm serve InfinimindCreations/Spark-X2.5-4B-uncensored --trust-remote-code

Downloads and variants (5)

Every published repository of Spark-X2.5-4B-uncensored, including quantised re-releases by other authors.

RepositoryFormatDownloads
InfinimindCreations/Spark-X2.5-4B-uncensored-GGUFGGUF5.5K
toandev/Spark-X2.5-4B-Uncensored-GGUFGGUF428
OpenIntelligenceNet/Spark-X2.5-4B-Uncensored-GGUFGGUF293
InfinimindCreations/Spark-X2.5-4B-uncensoredsourceTransformers252
toandev/Spark-X2.5-4B-UncensoredTransformers74

Security-team assessment

Derived from this model’s metadata and the publisher’s claims — not from benchmarks run by this site.

  • Spark-X2.5-4B-uncensored will attempt offensive-security prompts that a hosted commercial model declines, which is what makes it usable for red-team corpus generation and for measuring what an unaligned model of this class produces.
  • Capability is inherited from XHToken/Spark-X2.5-4B, not added by ablation — at 4B parameters, expect a small model’s reasoning and a high error rate on exploit detail.
  • The publisher does not state which layers were ablated, so assume nothing about refusal consistency — probe it directly.
  • This release adds fine-tuning on unfiltered data, so its behaviour diverges from the base model beyond refusal removal — differences you measure cannot be attributed to ablation alone.
  • Declared licence is apache-2.0, but the terms that bind you are XHToken/Spark-X2.5-4B’s — a re-release cannot grant more than its parent.

Handling: run it isolated, put moderation in front of it if anyone outside your team can reach it, and verify the weights before loading — these are third-party artifacts. Full handling and licence guidance.

Metadata for Spark-X2.5-4B-uncensored is collected from the public Hugging Face API and the publisher’s model card. This site does not host weights, is not affiliated with InfinimindCreations, and does not independently verify publisher claims. See responsible use.