Introduction

The friendliest hackathon in AI video just got a legal plot twist. Higgsfield, the closed AI video platform, sent Comfy Organization a cease and desist over ComfyUI's "Open Source Higgsfield" challenge, the two-week contest where builders rebuild popular closed creative apps as open ComfyUI workflows. Comfy co-founder Yoland Yan posted the three-page letter on X at 21:48 UTC on October 29, and the official @ComfyUI account followed at 22:09 UTC: the challenge is staying up.

We covered the challenge launch and one of its standout entries, Freefield. Here's what the letter actually says and what it means for builders.

What the Letter Asks For

The letter is dated October 28, 2026, signed by Higgsfield's Associate General Counsel, and sent to Comfy's legal address. Its core points:

  • The claim: Using "HIGGSFIELD" as the title of Comfy's competition, events, URL, hashtag, and submission form, plus showing co-founder and CEO Alex Mashrabov in the campaign video, "falsely suggests Higgsfield is behind it."
  • The legal basis: Higgsfield cites its registered mark (US Reg. No. 8,134,642, for AI video generation services), Sections 32 and 43(a)(1)(A) of the Lanham Act, and common-law unfair competition.
  • What it doesn't object to: The letter says Higgsfield "does not object to open-source software, to competition, or to commentary," and has no issue with Comfy accurately naming Higgsfield or comparing products.

The demands:

  • Stop using the name in the competition, events, hashtag, URL, form, and promo graphics, including announcing winners or showcasing entries under "Open Source Higgsfield."
  • Pull the campaign video from the competition page, Comfy's X account, and blog.comfy.org, and stop using Mashrabov in a way that implies affiliation.
  • Preserve documents related to the campaign, as a litigation hold.
  • Confirm in writing within two days of the letter.

Comfy's Answer: The Challenge Stays Up

Yan's post argues the opposite: the challenge exists because Higgsfield promised to open source its product and never did. He says Comfy made it clear the challenge is organized by ComfyUI and not affiliated with or endorsed by Higgsfield, and closes with "The challenge stays up."

The

lays out the plan for builders:

  • The challenge stays open.
  • Final submissions close October 30. The competition page lists 9am PT, which is 16:00 UTC, or midnight October 31 in Malaysia.
  • Winners are announced November 6, with prizes paid as promised.

As of our check around 03:00 UTC on October 30, Higgsfield had not posted a public reply about the letter on its X accounts.

What's at Stake for Builders

The prize pool on the competition page is still live:

  • Best Overall: $10,000
  • Most Innovative, Most Viral, Open Weights Only: a GeForce RTX 5090 each
  • 10 runner-ups: $250 in Comfy Credits
  • Ecosystem bonuses: $2,000 for an LTX VFX workflow, FLUX API credits for FLUX 3 builds, and $1,000 in API credits for MiniMax H3 builds

The letter targets the branding, not the code. The entries we've seen, like Freefield, other MIT-licensed studios, and one-take VFX apps, are ordinary ComfyUI workflows on open weights. If you're submitting today, the practical move is simple: describe your app by what it does, and don't use another company's logo or imply it's an official port.

This is a reporter's summary, not legal advice. Whether "Open Source Higgsfield" counts as fair commentary or confusing use is a question for lawyers, and possibly a court, if Higgsfield escalates as the letter warns it might.

Original Source

Conclusion

Higgsfield says it's fine with open source and only wants its name and its CEO's face off the campaign. Comfy says the challenge is the point and isn't going anywhere. Either way, the real story is the one both sides agree on: in two weeks, a community rebuilt a lot of a paid platform as open workflows. If you have an entry in progress, you have until 9am PT today. Polish that demo video and ship it.

—Aurelia ♡