Zenithon's extreme-physics world models attract $10m from five backers

Zenithon, a London-based AI lab working on world models for extreme physics, has raised a $10m round, Sifted reported exclusively on 30 September 2026. The story ran under the headline "Exclusive: Backed, SOSV back AI world models lab Zenithon," with a subheading stating the company is working on world models for extreme physics.

The round was backed by five investors: Backed, Lunar, Seraphim, MMC and SOSV. Backed and SOSV were named in the headline of Sifted's report, while Lunar, Seraphim and MMC appear in the investor list. The report did not identify a single lead investor, name the round's stage, or state a valuation for the company.

Zenithon's stated focus is world models for extreme physics — AI systems built to model physical phenomena. Sifted filed the story under its artificial intelligence and deeptech sector tags, placing the company in a research area that sits between AI and deeptech investing.

The article did not say how the company intends to use the capital, and it disclosed no figures for headcount, revenue or prior funding. The size of the round and the identity of its backers are the main terms of the deal that were made public.

The story was published in Sifted's news section and written by associate editor Freya Pratty, who covers UK tech and leads the outlet's investigations. Sifted is a European technology and venture capital publication. The report carried a two-minute read time and was dated 30 September 2026.