Tudor Achim (@tachim) — Twitter Score 38 out of 1000

Tudor Achim is an AI founder who co-founded Harmonic, a commercial research lab focused on mathematical superintelligence, and serves as its CEO. Tudor Achim's Twitter Score is 38 out of 1000 as of October 2026, ranking #25,003 (top 10%) among 493,476 tracked accounts.

Tudor Achim co-founded Harmonic alongside Vlad Tenev in 2023, with the goal of building a mathematical reasoning engine. The lab's first published research output was Aristotle, an automated theorem prover designed to produce formally verifiable mathematical proofs. Tudor Achim also co-founded Helm.ai, an autonomous driving AI company that began in 2016 and later emerged from stealth with a seed funding announcement.

Tudor Achim has led Harmonic through a rapid sequence of funding rounds. The company raised a $75 million Series A in September 2024, led by Sequoia Capital with participation from Index Ventures, followed by a $100 million Series B in July 2025 led by Kleiner Perkins, with notable participation from crypto-focused venture firm Paradigm. In November 2025, Harmonic closed a $120 million Series C at a post-money valuation of $1.45 billion, led by fintech-focused Ribbit Capital, with Sequoia Capital, Index Ventures, Kleiner Perkins, and Emerson Collective also participating.

Tudor Achim is active on Twitter with 237 posts, and has been mentioned by 13 accounts a total of 38 times.

Who follows Tudor Achim on X?

The accounts that follow Tudor Achim include 132 founders, 47 angel investors, 18 influencers and 4 VCs, among them Marc Andreessen, Kyle Samani, Dan Robinson, Vlad Tenev, Tarun Chitra and Vance Spencer.