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Mage-Flow
An Efficient Native-Resolution Foundation Model for Image Generation and Editing

GitHub

Mage-Flow is a compact 4B-scale generative stack for efficient text-to-image generation and instruction-based image editing. Instead of scaling to tens of billions of parameters, Mage-Flow reaches state-of-the-art-competitive quality through careful tokenizer–backbone–system co-design, so it stays fast, memory-light, and easy to fine-tune under realistic compute budgets.

The stack is built from two shared, co-designed components:

Mage-VAE — a lightweight, high-fidelity latent tokenizer (one-step diffusion encode/decode with anchor-latent KL regularization).
NR-MMDiT — a shared 4B Native-Resolution Multimodal Diffusion Transformer, trained with rectified flow matching in the Mage-VAE latent space.

Together with native-resolution packing and a fused-kernel training infrastructure, this shared stack powers two model instantiations: Mage-Flow for text-to-image generation and Mage-Flow-Edit for instruction-based image editing. Each ships in Base, RL-aligned, and 4-step Turbo variants.

✨ Highlights

Compact & competitive. A single 4B family for generation and editing that matches or beats much larger open systems (Qwen-Image 20B, Z-Image 6B, FLUX.2 32B, FireRed-Image-Edit 20B).
Efficient tokenizer. Mage-VAE matches FLUX.2-VAE reconstruction fidelity while using ~12× / ~22× fewer encode / decode MACs per pixel, removing the VAE as the high-resolution bottleneck.
Native resolution. One checkpoint generates from 512 to 2048 on any aspect ratio, including extreme 4:1 (e.g. 512×2048, 2048×512).
System-level speed. Native-resolution packing (FlashAttention var-len + per-sample 2D RoPE) + fused CUDA kernels cut per-step training time from ~1.93 s → ~0.78 s (~2.5× faster training); CFG's conditional/unconditional branches run in one packed forward.
Full family. Base, RL-aligned, and 4-step Turbo variants for both generation and editing.
Versatile editing. Mage-Flow-Edit supports semantic content editing, appearance transformation, image restoration, and structure-aware outputs within a unified image-and-text-conditioned model. See the report's editing galleries.
Interactive latency. At 1024² on a single A100: Mage-Flow-Turbo 0.59 s/image, Mage-Flow-Edit-Turbo 1.02 s/edit, peak memory ~18–20 GB (lowest among compared systems).

One-to-many editing diversity — Mage-Flow-Edit can generate diverse outputs from a single reference image.

📥 Model Zoo

Each checkpoint is a self-contained diffusers-style repo (transformer/ + shared vae/, text_encoder/, scheduler/).

Model	Task	Variant	Steps	Hugging Face
`Mage-Flow-4B-Base`	text→image	Base	30	🤗 microsoft/Mage-Flow-Base
`Mage-Flow-4B`	text→image	RL-aligned	20	🤗 microsoft/Mage-Flow
`Mage-Flow-4B-Turbo`	text→image	Few-step distilled	4	🤗 microsoft/Mage-Flow-Turbo
`Mage-Flow-Edit-4B-Base`	editing	Base	30	🤗 microsoft/Mage-Flow-Edit-Base
`Mage-Flow-Edit-4B`	editing	RL-aligned	30	🤗 microsoft/Mage-Flow-Edit
`Mage-Flow-Edit-4B-Turbo`	editing	Few-step distilled	4	🤗 microsoft/Mage-Flow-Edit-Turbo

🖼️ Showcase

Text-to-image — prompt following, fine detail, and legible English/Chinese text rendering. (The first panel is open; click a title to expand the others.)

Showcase

General scenes

Portraits

Cuisine & still life

English text rendering

Chinese text rendering

Instruction-based editing — appearance, content, scene/subject, human-centered & creative, low-level, and restoration edits (source → result). (The first panel is open; click a title to expand the others.)

Various Editing I

Various Editing II

Localized content & object editing

Scene, subject & camera transformations

Appearance & artistic rendering

Human-centered & creative editing

Low-level vision & conditional reconstruction

Bidirectional degradation & restoration

📊 Performance

Full benchmark tables (text-to-image & image editing) — click to expand

Text-to-image — full benchmark suite: GenEval, DPG-Bench, TIIF-Bench (short/long splits), CVTG-2K, OneIG (EN/CN), LongText (EN/CN). Higher is better; GenEval / CVTG-2K / OneIG / LongText on a 0–1 scale, DPG / TIIF on 0–100. The Type column marks closed- vs open-source; bold / underline = best / second-best among open-source models (closed-source shown for reference, not ranked); – = not reported; ★ = ours.

Model	Type	#Params	Steps	GenEval	DPG	TIIF-Short	TIIF-Long	CVTG-2K	OneIG-EN	OneIG-CN	LongText-EN	LongText-CN
Seedream 3.0	Closed	–	–	0.84	88.27	86.02	84.31	0.592	0.530	0.528	0.896	0.878
Seedream 4.0	Closed	–	–	0.84	88.63	–	–	0.892	0.573	0.554	0.936	0.946
GPT-Image-1	Closed	–	–	0.84	85.15	89.15	88.29	0.857	0.533	0.474	0.956	0.619
Nano-Banana-Pro	Closed	–	–	0.83	87.16	–	–	0.779	0.580	0.570	0.981	0.949
FLUX.1-dev	Open	12B	50	0.66	83.84	71.09	71.78	0.496	0.434	0.245	0.607	0.005
FLUX.1-Krea-dev	Open	12B	50	0.72	86.59	80.36	81.67	0.444	0.443	0.271	0.693	0.002
FLUX.2-dev	Open	32B	50	0.87	87.57	88.82	88.10	0.893	0.551	0.516	0.963	0.757
FLUX.2-Klein-Base-4B	Open	4B	50	0.78	83.02	79.94	80.01	0.656	0.485	0.366	0.554	0.071
FLUX.2-Klein-Base-9B	Open	9B	50	0.83	85.29	81.47	84.52	0.655	0.544	0.400	0.872	0.227
FLUX.2-Klein-4B	Open	4B	4	0.83	85.53	78.91	79.04	0.628	0.500	0.364	0.649	0.068
FLUX.2-Klein-9B	Open	9B	4	0.86	86.20	85.22	84.13	0.424	0.538	0.406	0.872	0.226
Qwen-Image	Open	20B	50	0.87	88.32	86.14	86.83	0.829	0.539	0.548	0.943	0.946
JoyAI-Image	Open	16B	50	–	88.05	–	–	0.874	0.542	0.521	0.963	0.963
HunyuanImage-3.0	Open	80B	50	0.72	86.10	–	–	0.765	–	–	–	–
LongCat-Image	Open	6B	50	0.87	86.80	80.93	81.30	0.866	0.516	0.518	0.885	0.956
Z-Image-Base	Open	6B	50	0.84	88.14	80.20	83.04	0.867	0.546	0.535	0.935	0.936
Z-Image-Turbo	Open	6B	8	0.82	84.86	77.73	80.05	0.859	0.528	0.507	0.917	0.926
Mage-Flow-Base ★	Open	4B	30	0.79	86.26	82.50	83.19	0.851	0.542	0.509	0.904	0.792
Mage-Flow ★	Open	4B	20	0.90	86.49	82.19	84.70	0.887	0.536	0.505	0.944	0.823
Mage-Flow-Turbo ★	Open	4B	4	0.88	85.48	83.58	84.16	0.873	0.523	0.491	0.911	0.801

Image editing — ImgEdit-Bench (0–5), GEdit-Bench EN/CN (0–10), TextEdit-Bench synthetic/real (0–25). Higher is better; the Type column marks closed- vs open-source; bold / underline = best / second-best among open-source models; – = not reported; ★ = ours.

Model	Type	#Params	Steps	ImgEdit	GEdit-EN	GEdit-CN	TextEdit-Syn	TextEdit-Real
Nano-Banana	Closed	–	–	4.29	7.291	7.399	16.54	18.22
Seedream 4.0	Closed	–	–	4.30	7.701	7.692	14.90	18.54
Seedream 4.5	Closed	–	–	4.32	7.820	7.800	–	–
Nano-Banana-Pro	Closed	–	–	4.37	7.738	7.799	–	–
Step1X-Edit-v1.2	Open	19B	50	3.95	7.480	7.467	9.26	12.02
FLUX.1-Kontext-dev	Open	12B	28	3.71	6.462	1.857	12.14	14.31
FLUX.2-dev	Open	32B	50	4.35	7.413	7.278	11.86	14.71
FLUX.2-Klein-Base-4B	Open	4B	50	3.80	7.081	7.102	11.01	13.79
FLUX.2-Klein-4B	Open	4B	4	4.01	7.717	7.750	11.84	14.46
FLUX.2-Klein-Base-9B	Open	9B	50	4.05	7.740	7.745	12.76	15.65
FLUX.2-Klein-9B	Open	9B	4	4.18	8.040	8.055	12.73	15.75
Z-Image-Edit	Open	6B	50	4.30	7.570	7.540	–	–
Qwen-Image-Edit-2509	Open	20B	50	4.31	7.480	7.467	13.40	15.81
Qwen-Image-Edit-2511	Open	20B	50	4.51	7.877	7.819	13.53	16.81
LongCat-Image-Edit	Open	6B	50	4.45	7.748	7.731	12.46	14.89
FireRed-Image-Edit-1.0	Open	20B	50	4.56	7.943	7.887	15.19	17.23
JoyAI-Image-Edit	Open	16B	50	4.46	8.276	8.125	14.80	17.23
Mage-Flow-Edit-Base ★	Open	4B	30	4.28	7.860	7.970	13.63	15.57
Mage-Flow-Edit ★	Open	4B	30	4.34	8.127	8.123	14.14	16.26
Mage-Flow-Edit-Turbo ★	Open	4B	4	4.38	8.271	8.264	12.77	15.41

🏗️ Architecture

Mage-VAE — a latent tokenizer built as a symmetric one-step diffusion codec: the decoder is a fully-convolutional one-step pixel-diffusion model (no global-attention blocks), and the encoder is its architectural dual (a one-step latent generator conditioned on pixels). A standard Gaussian-prior KL is replaced with an anchor-latent KL that regularizes the posterior toward FLUX.2-VAE latents, giving a generation-ready 128-channel, 16×-downsampled latent space.

Mage-VAE — anchor VAE (FLUX.2-VAE), the symmetric one-step encoder/decoder architecture, and the three-stage training pipeline.

Mage-Flow — a 4B Multimodal DiT that encodes prompts with Qwen3-VL and images with Mage-VAE, then processes packed variable-length image+text sequences with per-sample 2D rotary embeddings and joint self-attention. Native-resolution packing removes bucket quantization and padding, lets one checkpoint generalize to any output size, and fuses the CFG cond/uncond branches into a single forward.

Mage-Flow / Native-Resolution MMDiT architecture

Mage-Flow — native-resolution packing of variable-length image+text tokens through the Native-Resolution MMDiT (left), and the dual-stream MMDiT block (right).

Post-training — from Base, generation is aligned with Diffusion-NFT (prompt following, aesthetics, text rendering, preference) to produce the RL model, and distilled with decoupled-DMD + adversarial perceptual guidance into the 4-step Turbo. Editing models reuse the recipe, trained on a mixture of generation and editing data to keep the generative prior.

🚀 Quick Start

Installation

Install everything except flash-attn first, then install flash-attn separately with build isolation off — it compiles a CUDA extension against your installed torch, so torch and a matching CUDA toolkit must already be present.

bash

cd Mage/mage_flow
uv venv && source .venv/bin/activate

# 1) Pinned, tested dependency set (torch 2.13, transformers 5.5, diffusers 0.38, pillow 12.3, …).
#    Recommended for reproducibility. `uv pip install -e .` also works, but its loose
#    bounds may resolve to a newer torch/transformers than the code was tested against.
uv pip install -r requirements.txt
uv pip install -e . --no-deps           # the mage-flow package itself

# 2) flash-attn — needs build tools present and a CUDA toolkit whose MAJOR version
#    matches your torch build (e.g. torch cu12x ↔ nvcc 12.x). A cu13/nvcc-12 mix fails.
uv pip install setuptools wheel ninja
uv pip install --no-build-isolation flash-attn==2.8.3

Plain pip is equivalent (pip install -r requirements.txt, pip install -e . --no-deps, then the two flash-attn lines). This registers three commands: mage-flow, mage-flow-edit, mage-flow-app.

torch / CUDA: the default PyPI torch wheel targets the newest CUDA (currently cu13x). If your machine's CUDA toolkit is 12.x, install torch from the matching index first, e.g. uv pip install torch==2.13.0 torchvision==0.28.0 --index-url https://download.pytorch.org/whl/cu126, otherwise the flash-attn build will fail with a CUDA-version mismatch. (torch 2.13.0 ships cu126/cu129/cu130 wheels — pick the one matching your nvcc.)

Python API

pipe.generate(prompts, **kw) and pipe.edit(prompts, ref_images, **kw) return a list[PIL.Image] aligned with prompts. A prompts list is batched into one packed forward per denoise step (each sample can have its own resolution/seed).

Text-to-image:

python

from mage_flow import MageFlowPipeline

pipe = MageFlowPipeline.from_pretrained("microsoft/Mage-Flow", device="cuda")

# 1) single image
img = pipe.generate(["A close-up portrait of an elderly African man with deep wrinkles, wearing a traditional hat, soft natural lighting, ultra realistic."],
                    steps=20, cfg=5.0, heights=[1024], widths=[1024])[0]
img.save("t2i.png")

# 2) batch: several prompts / resolutions / seeds in ONE packed forward per step
imgs = pipe.generate(
    ["the Salar de Uyuni mirror surface captured at high noon, with intimate stillness permeating the air. dew beads on every blade of grass. National Geographic editorial, cinematic depth, fine-grained natural texture.", 
     "A close-up portrait of an elderly African man with deep wrinkles, wearing a traditional hat, soft natural lighting, ultra realistic.", 
     "An immersive close-up of a steaming bowl of Sichuan mapo tofu over jasmine rice served on a hand-thrown ceramic plate, finished with a wedge of citrus. Surface oils catch a tiny specular highlight. Shot with a Hasselblad H6D-100c, ambient window light, the kind of image that makes the viewer hungry."],
    heights=[512, 1024, 1792], widths=[2048, 1024, 1024],   # per-sample; 4:1 is fine
    seeds=[1, 2, 3], steps=20, cfg=5.0,
)

Image editing:

python

from mage_flow import MageFlowPipeline

pipe = MageFlowPipeline.from_pretrained("microsoft/Mage-Flow-Edit", device="cuda")

# single reference (path or PIL image)
img = pipe.edit(["Replace the background with a field of sunflowers"], ["assets/dog.jpg"],
                steps=30, cfg=5.0, max_size=1024)[0]
img.save("single_edit.png")

# multi-image edit — ref_images[i] is a LIST of source images
img = pipe.edit(["blend the object from image 2 into image 1"],
                [["scene.png", "object.png"]], steps=30, cfg=5.0)[0]
img.save("multi_edit.png")

# explicit output size (overrides max_size); Turbo edit = 4 steps / cfg 1
img = pipe.edit(["Replace the background with a field of sunflowers"], ["assets/dog.jpg"],
                heights=[1024], widths=[1024], steps=4, cfg=1.0)[0]
img.save("single_edit_1024x1024.png")

Parameters (shared by generate / edit):

Parameter	Default	Description
`prompts`	—	string or list of strings; a list is batched into one forward per step
`ref_images` (edit)	—	per prompt: one image/path, or alist of images for multi-image edit
`steps`	`30`	denoising steps — Base`30`, RL `20`, Turbo `4`
`cfg`	`5.0`	classifier-free guidance scale (Turbo:`1.0`)
`heights`, `widths`	`[1024]`	per-sample output size, multiple of 16; native resolution`512`–`2048`
`max_size` (edit)	source size	longest output side; short side follows the reference's aspect ratio
`vl_cond_long_edge` (edit)	`384`	cap the long edge of the reference image fed to theVL text encoder (matches training preprocessing; the VAE/generation path keeps the full output resolution). `0`/`None` disables
`neg_prompts`	`" "`	per-sample negative prompt (applied when`cfg > 1`)
`seeds`	`42`	per-sample seed;`-1` = random
`batch_cfg`	`True`	fuse the CFG conditional + unconditional passes into one packed forward
`renormalization`	`False`	rescale guided velocity per token (reduces over-saturation at high cfg)
`static_shift`	`6.0`	override the flow-matching sigma shift
`prompt_template`	`mage-flow` / `mage-flow-edit`	text-encoder prompt template

CLI

bash

# text-to-image (two prompts in one batch)
mage-flow --prompt "A close-up portrait of an elderly African man with deep wrinkles, wearing a traditional hat, soft natural lighting, ultra realistic." "An immersive landscape of a Greenlandic icefjord at midnight sun, painted by early dawn light, crystal-clear skies adding drama. fine grains of sand carving sharp shadows. Peter Lik gallery print, moody atmosphere, museum-grade composition." \
          --model_path microsoft/Mage-Flow --steps 20 --cfg 5.0 \
          --height 1024 512 --width 1024 2048 --seed 42 --out ./outputs


# editing (one --ref per prompt; comma-separate sources for multi-image edit)
mage-flow-edit --prompt "Replace the background with a field of sunflowers" "blend these two images" \
               --ref assets/dog.jpg "scene.png,object.png" \
               --model_path microsoft/Mage-Flow-Edit --max_size 1024 --out ./outputs

Flag	Scope	Meaning
`--prompt`	both	one or more prompts, run as a batch (sample `i` uses `--seed + i`)
`--model_path`	both	local repo dir or HF Hub repo id (auto-downloaded + cached)
`--steps`	both	number of denoising steps
`--cfg`	both	classifier-free guidance scale
`--height`	both	output height — one value, or one per prompt for mixed resolutions
`--width`	both	output width — one value, or one per prompt for mixed resolutions
`--seed`	both	base seed (sample `i` uses `--seed + i`)
`--neg_prompt`	both	negative prompt
`--static_shift`	both	override the flow-matching sigma shift
`--out`	both	output directory
`--ref`	edit	reference image per prompt (comma-separate paths for a multi-image edit)
`--max_size`	edit	max size of the reference image
`--vl_cond_long_edge`	edit	VL-condition long edge (default `384`)

Gradio app

mage-flow-app # serve on http://0.0.0.0:7860 (or: python -m mage_flow.app)

A web UI with Text → Image and Image Edit tabs; models load lazily on first use and are cached. Presets default to the microsoft/Mage-Flow* Hugging Face repos (downloaded + cached on first use); set MAGEFLOW_HF_DIR to load local checkpoint dirs instead.

Launch options:

Flag	Default	Meaning
`--host`	`0.0.0.0`	bind address
`--port`	`7860`	port
`--device`	`cuda`	inference device
`--share`	off	create a public Gradio share link
`--preload`	(lazy)	comma-separated repo ids / paths to load at startup instead of on first use

📝 Citation

bibtex

@article{zhang2026mageflow,
  title={Mage-Flow: An Efficient Native-Resolution Foundation Model for Image Generation and Editing},
  author={Zhang, Xinjie and Zhang, Peng and Zheng, Shicheng and Guo, Jinghao and Jia, Zhaoyang and Shen, Yifei and Guo, Xun and Luo, Yuxuan and Li, Jiahao and Xie, Wenxuan and Pu, Fanyi and Zhang, Xiaoyi and Zhang, Kaichen and Guo, Zongyu and Bi, Tianci and Gui, Dongnan and Liu, Zhening and Wen, Zimo and Zheng, Zihan and Yang, Senqiao and Li, Xiao and Wang, Jinglu and Li, Bin and Lu, Yan},
  journal={arXiv preprint arXiv:2607.19064},
  year={2026}
}

Mage-Fans/Mage-Flow

Mage-FlowAn Efficient Native-Resolution Foundation Model for Image Generation and Editing