Fun facts

Light trivia about the codebase. Not load-bearing.

"comfyanonymous"

The project's namesake author goes by comfyanonymous everywhere — the GitHub handle, the git author name, the repo URL. As of HEAD they have authored 3,125 of 5,110 commits (61%) — solo project growth that turned into a full ecosystem with the Comfy-Org organization layered around it (frontend, desktop, manager, cloud).

The first commit

2023-01-03  220afe33  Initial commit.

By 2023-01-22 ComfyUI already had:

• A LoadImage node for img2img
• The IS_CHANGED mechanism for incremental re-execution
• An execution scheduler that "tries to execute the outputs that take the less steps first"
• Single-line string properties on nodes

In other words, the graph executor with caching — still the heart of the codebase — existed within three weeks of the first commit.

The biggest file in the repo is a stub

comfy_api_nodes/apis/__init__.py weighs in at 6,155 lines. It is a single file of generated Pydantic models for every paid-API integration in comfy_api_nodes/. The comfy_api/generate_api_stubs.py script regenerates these stubs and the update-api-stubs.yml workflow runs them.

The runner-up is more representative of the codebase: comfy_api_nodes/nodes_kling.py at 3,327 lines — one file for one paid video provider. Several other paid-API node modules (Wan, ByteDance, Vidu) clear 1,500 lines too.

ComfyUI as a model release seismograph

comfy/supported_models.py is 1,884 lines of ModelXXX classes — one entry per architecture the engine has ever shipped support for. Walking comfy/text_encoders/ and comfy/ldm/ is essentially a year-by-year list of which generative models mattered to the team:

• Image: SD1.x, SD2.x, SDXL, Stable Cascade, Pixart, AuraFlow, HunyuanDiT, SD3/3.5, Flux (and Flux 2, Kontext, Krea), Lumina 2, HiDream, Qwen Image, Hunyuan Image 2.1, Z Image, Chroma Radiance, Omnigen 2.
• Video: Stable Video Diffusion, Mochi (Genmo), LTX-Video (Lightricks), Hunyuan Video, Wan 2.1/2.2, Hunyuan Video 1.5, Kandinsky 5, Cosmos.
• Audio: Stable Audio, ACE Step.
• 3D: Hunyuan3D 2.0/2.1.

If you ever forget when something dropped, git log --diff-filter=A -- comfy/ldm/<model>/ will tell you.

A "wiki bot" is the most active non-comfyanonymous author

Of the 5,110 commits, the second-most-prolific named author after comfyanonymous is:

Author	Commits
comfyanonymous	3,125
Alexander Piskun	256
pythongosssss	231
Chenlei Hu	118
rattus	105
ComfyUI Wiki	98

That last one is a bot that mirrors the GitHub Wiki pages back into the repo. It is one of only three "bot" authors in the entire history (118 commits combined out of 5,110 — about 2.3%).

The hook_breaker_ac10a0 module

There is a top-level file called hook_breaker_ac10a0.py — 17 lines — whose entire job is to save and restore monkey-patched function references that custom nodes might have installed. The cryptic suffix is unique enough to make collisions with custom-node names impossible. It runs around prompt execution in main.py so that one badly-behaved custom node can't hijack the runtime forever.

Telemetry-off, on principle

main.py sets two environment variables before importing anything that might phone home:

os.environ['HF_HUB_DISABLE_TELEMETRY'] = '1'
os.environ['DO_NOT_TRACK'] = '1'

The README also brags: "Works fully offline: core will never download anything unless you want to." The frontend manager is the one place that opts back into network access — and only to fetch frontend releases.

The 16,384 pixel limit

nodes.py defines MAX_RESOLUTION = 16384. Every built-in node that takes a width or height clamps to this. Yes, it is exactly 2¹⁴.