AI-KSK/MiniMax-H3-Image-Full-BF16-ComfyUI

AIKSK MiniMax-H3-Image Full BF16 — ComfyUI Conversion

Community conversion of the official unpruned MiniMax-H3-Image weights for the ComfyUI single-file format. CPU conversion and all 531 tensor comparisons passed. Actual ComfyUI loading, GPU generation, image quality and peak VRAM have not been tested.

This repository contains a format conversion only. AIKSK is not the author of the model and does not represent MiniMax or ComfyUI. All model weights originate from the official release below.

1. Upstream source

Item	Value
Base model	MiniMaxAI/MiniMax-H3-Image
Pinned revision	00dd081ebdd33315adf2c4d84f64aa327ddf3039
Upstream license	MiniMax-H3-Image Community License Agreement (see LICENSE)

2. What this file is

• Full, unpruned weights — not the pruned Comfy-Org release, not the P-H3-Image (PrunaAI) variant, and not the H3 video model.
• BF16 / F32 preserved — not quantized, not pruned, not trained, not fine-tuned.
• Single-file safetensors for ComfyUI's models/diffusion_models/ directory.
• Structure targets the verified ComfyUI 0.45.0: minimax_h3_image, 50 layers, 24 latent channels, full AdaLN path, PDD 6 steps.

Conversion actions (531 tensors total)

Action	Count	Notes
Byte-identical copy	477	—
QKV de-interleave	52	Lossless row permutation (out[part, head, :] = src[head, part, :]), 56 heads × 128 head_dim, 21,504 rows/tensor, ~12.02 GB of payload, bit-identical
PDD output-head encoding	2	Delta-encoded; FP32 rounding is involved — this is not byte-identical to the source

Because of the PDD head encoding, this file is not a byte-for-byte copy of the upstream weights. The QKV step alone is lossless.

3. File facts

Item	Value
Filename	minimax_h3_image_full_bf16_comfyui.safetensors
Exact bytes	66,289,412,544 (≈66.29 GB / 61.74 GiB)
SHA256	76df6d438bcd60ecbfec2c9f6df6e116158b5f3ba8210583266f711eaf4c594b
Tensors	531
Tensor bytes	66,289,356,096
BF16 bytes	66,211,541,504
F32 bytes	77,814,592
Embedded metadata	pdd_steps=6, pdd_sigmas=[1.0, 0.9675236940383911, 0.8875485062599182, 0.75, 0.5327739119529724, 0.23200887441635132, 0.0]

4. Verification status — completed vs. not tested

Completed (CPU only):

• Full deep tensor comparison: 531 / 531 tensors, zero skipped, zero mismatched.
• Independent QKV spot check: 52 tensors, 312 rows matched the corresponding rows of the existing Comfy BF16 release.
• PDD decode maximum absolute error: 1.86264514923e-09 (within the agreed tolerance).
• Source shard sizes, mtimes and header fingerprints unchanged; official source hashes authenticated during the formal run.
• Formal run 2026-11-12T03:30:22 → 03:41:02 (+08:00), 10 min 40 s total; 6 min 8 s of that was writing the output file.

NOT tested (do not assume):

• Actual ComfyUI loading of this file.
• GPU inference / text-to-image / image editing.
• Image quality.
• Peak VRAM usage.

No sample images are provided, and no images from other models are presented as outputs of this file.

5. Usage

Place the file in your ComfyUI installation:

ComfyUI/models/diffusion_models/minimax_h3_image_full_bf16_comfyui.safetensors

You also need a compatible text encoder, VAE and workflow. This repository ships only the diffusion model — the text encoder, VAE and prompt-enhancement models are out of scope.

A commonly cited workflow baseline for later validation is 6 steps / CFG 1 / Euler / simple. That is a starting point for your own testing, not a sampling result verified with this file.

6. Hardware note

The weights are ≈61.74 GiB, which exceeds a 48 GiB GPU. Expect to need offloading and working headroom. File size is not a measurement of VRAM usage — peak VRAM for this file is unknown.

7. License and redistribution

This conversion is distributed under the MiniMax-H3-Image Community License Agreement — see LICENSE (verbatim upstream text) and NOTICE.

Important points you must read in the full agreement:

• The license is limited to the Applicable Territory, defined as worldwide excluding the Excluded Territories: the European Union, the United Kingdom, the Republic of Korea and the United States of America.
• Redistribution requires providing a copy of the agreement, carrying prominent notices on modified files, and shipping the NOTICE text.
• Commercial use above 1M USD annualized revenue, or providing a Hosted Service, requires separate prior written authorization from MiniMax.

Nothing about this repository being downloadable, private, or gated by itself demonstrates compliance with those territorial terms.

8. Modifications

See MODIFICATIONS.md for the exact list of modified files, hashes, conversion date and the nature of each change.