This repository contains a true dynamic-ConvRot INT8 conversion of DreamFast/Qwen3-VL-4b-Heretic, packaged as a single-file ComfyUI text encoder for Krea 2.

Krea 2 uses Qwen3-VL-4B-Instruct conditioning, not the text-only Qwen3-4B architecture. The Heretic source is an abliterated derivative of Qwen/Qwen3-VL-4B-Instruct.

Downloads

Precision	File	Size	Notes
INT8	`qwen3-vl-4b-heretic_int8_dynamic_convrot.safetensors`	4.84 GB	Hosted in this repository; recommended
BF16	Upstream BF16 safetensors	8.88 GB	Publicly hosted by DreamFast; not duplicated here

INT8 SHA-256:

c766f6f078bbfe7474699faaceb9484251b0c7c8dd4bf2d5730b320feca54778

Quantization

Built with silveroxides/convert_to_quant 1.3.1 at commit ee83a4d90d18f52824c3b6b23e45bc7514fb027e.

356 INT8 weights with per-row FP32 scales
All 356 quantized layers contain convrot: true ComfyUI metadata
Dynamic ConvRot group sizes:
- 216 layers at 256
- 72 layers at 1,024
- 68 layers at 4,096
357 embeddings, norms, biases, and other sensitive tensors remain BF16
Deterministic seed 42
Prodigy learned rounding

Conversion command:

bash

ctq \
  -i qwen3-vl-4b-heretic.safetensors \
  -o qwen3-vl-4b-heretic_int8_dynamic_convrot.safetensors \
  --int8 \
  --scaling_mode row \
  --dynamic-convrot \
  --comfy_quant \
  --save-quant-metadata \
  --low-memory \
  --device cuda \
  --heur \
  --exclude-layers \
  '(embed|norm|bias|lm_head|spiece_model|multi_modal_projector|patch_embed|patch_conv)' \
  --verbose NORMAL \
  --manual-seed 42

Fidelity versus BF16

Four varied prompts were encoded through ComfyUI's Krea 2 loader with BF16 as the reference.

Metric	INT8 dynamic ConvRot
Mean cosine similarity	0.999853
Mean relative L2 error	2.13%
Mean absolute error	0.03439
Mean maximum absolute error	2.816

ComfyUI verification

GPU loading, tokenization, and end-to-end Krea 2 encoding passed with:

ComfyUI commit 093d571b83e7a79833200e199b46b9f5a62217f9
Python from the ComfyUI 13_env Conda environment
PyTorch 2.11.0+cu130
comfy-kitchen 0.2.22
NVIDIA GeForce RTX 5090

The output conditioning shape was (1, 10, 30720), corresponding to the 12 Qwen3-VL hidden states used by Krea 2.

Installation

Download the INT8 file into:

ComfyUI/models/text_encoders/

Select it in CLIPLoader with type krea2.

The file is a ComfyUI single-file text-encoder checkpoint, not a complete Transformers repository.

Credits

Abliterated source and BF16 ComfyUI checkpoint: DreamFast/Qwen3-VL-4b-Heretic-ComfyUI
Original base model: Qwen/Qwen3-VL-4B-Instruct
Quantization tooling: silveroxides/convert_to_quant

ethanfel/Qwen3-VL-4B-Heretic-ComfyUI-ConvRot-INT8

Qwen3-VL-4B Heretic — Dynamic ConvRot INT8 for ComfyUI Krea 2