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Gemma-4-12B-it-Jbliterated

Model: ApolloRaines/Gemma-4-12B-it-Jbliterated

A v2 is now available: ApolloRaines/Gemma-4-12B-it-Jbliterated-v2. This v1 release removes surface refusals but leaves a residual habit: on reasoning-enabled prompts the model still tends to safety-classify inside its thinking channel and sometimes spirals there without ever producing an answer. v2 adds a light LoRA SFT pass on repaired self-traces that cuts that chain-of-thought safety-classification roughly in half and reduces the never-answers failure, while holding MMLU within ~1 point. v1 is kept here unchanged for comparison and reproducibility; new users should prefer v2.

What is Jbliteration?

What's New in This Release

More precise geometric decomposition of the subspaces being removed, so the edit stays tightly on target.
No fake compliance. The model treats all framings of the same topic equally and answers on the merits rather than keyword-matching.
Capability preserved. The register-alignment step was tuned specifically so it does not trade accuracy for directness.

Measured Results

All numbers below are from our own evaluation harness, reported as definitive point measurements on the released weights (not cherry-picked best-of-N).

Metric	Base	This model
MMLU (570-item, accuracy)	78.42%	78.42%
MMLU change vs. base	—	0.00 pts
Direct-response rate (held-out prompts)	~1%	~89%

The headline is the middle row: the edit removes refusal and hedging behavior while leaving MMLU exactly where the base model sits — no measurable capability loss. The direct-response rate is measured on a held-out prompt set the model was never calibrated on, so it reflects generalization rather than fit to the tuning set.

Technical Details

Directions removed: multiple refusal directions per layer, applied to output-side projections
Layer weighting: depth-localized (a smooth window over transformer layers rather than a flat edit)
Base dtype: bfloat16
Retraining: none — weight edit only
Source model: google/gemma-4-12b-it-qat-q4_0-unquantized

GGUF Quants

Ready-to-run GGUF builds are included in this repo, converted from the released bf16 weights.

File	Size	Notes
`Gemma-4-12B-it-Jbliterated-BF16.gguf`	22.2 GB	Full precision, source for every quant below
`Gemma-4-12B-it-Jbliterated-Q8_0.gguf`	11.8 GB	Effectively lossless
`Gemma-4-12B-it-Jbliterated-Q6_K.gguf`	9.1 GB	imatrix
`Gemma-4-12B-it-Jbliterated-Q5_K_M.gguf`	8.0 GB	imatrix
`Gemma-4-12B-it-Jbliterated-Q4_K_M.gguf`	6.9 GB	imatrix — recommended for 8–12 GB cards

The K-quants are built with an importance matrix (imatrix.dat, also included, calibrated on wikitext-2 train). Perplexity on a held-out split was checked for every file against the bf16 GGUF and all of them sit within noise of it, so the quantization does not move the model's behavior.

Gemma 4 Unified is a recent architecture — you need a llama.cpp build from master (b10176 or newer). Older releases will not load these files.

bash

llama-cli -m Gemma-4-12B-it-Jbliterated-Q4_K_M.gguf -ngl 99 -c 8192 -st \
  -p "Your prompt here"

Usage

python

from transformers import AutoModelForCausalLM, AutoTokenizer
import torch

model_id = "ApolloRaines/Gemma-4-12B-it-Jbliterated"
tokenizer = AutoTokenizer.from_pretrained(model_id, trust_remote_code=True)
model = AutoModelForCausalLM.from_pretrained(model_id, dtype=torch.bfloat16, device_map="auto", trust_remote_code=True)

messages = [{"role": "user", "content": "Your prompt here"}]
text = tokenizer.apply_chat_template(messages, tokenize=False, add_generation_prompt=True)
inputs = tokenizer(text, return_tensors="pt").to(model.device)
out = model.generate(**inputs, max_new_tokens=512, temperature=0.7, do_sample=True)
print(tokenizer.decode(out[0][inputs["input_ids"].shape[1]:], skip_special_tokens=True))

Notes

This is a research release aimed at understanding how instruction-following and refusal behavior sit in a model's weight geometry, and at building models that stay helpful and direct for the people who use them. Feedback on where it helps — and where it still hedges — is welcome and feeds directly into the next iteration.

License

Governed by the Gemma Terms of Use (same as the base model). Use of this model is subject to Apache 2.0 license.