Liam Fedus (@LiamFedus) — Twitter Score 101 out of 1000

Liam Fedus is an AI researcher who co-founded Periodic Labs, a startup building AI scientists and autonomous laboratories with an initial focus on the physical sciences. Liam Fedus's Twitter Score is 101 out of 1000 (an Excellent rating) as of September 2026, ranking #7,074 (top 5%) among 486,860 tracked accounts.

Liam Fedus previously served as VP of Post Training at OpenAI, where, per Felicis, he drove advances in ChatGPT and Operator. TechCrunch identifies him as one of the researchers who helped create ChatGPT and reports that he led the team behind the first trillion-parameter neural network. He also previously worked at Google Brain. Liam Fedus is currently a Distinguished Fellow at Fellows Fund.

Liam Fedus has 36,556 followers as of September 2026 and has published 1,238 posts. Periodic Labs announced a $300 million seed round on September 30, 2025, led by Andreessen Horowitz, with participation from Felicis, DST Global, NVIDIA, Accel, Elad Gil, Eric Schmidt, Jeff Dean, and Jeff Bezos as backers of the company. Among Periodic Labs' stated research goals are discovering higher-temperature superconductors and developing custom agents for a semiconductor manufacturer. Liam Fedus has been mentioned by 24 accounts a total of 37 times.

Who follows Liam Fedus on X?

The accounts that follow Liam Fedus include 369 founders, 115 angel investors, 57 influencers and 10 VCs, among them Sam Altman, Marc Andreessen, 6529, Andrej Karpathy, Garry Tan and Tarun Chitra.