Anastasios Nikolas Angelopoulos (@ml_angelopoulos) — Twitter Score 38 out of 1000

Anastasios Nikolas Angelopoulos is an AI researcher who co-founded Arena, an AI evaluation platform that benchmarks frontier models using human-preference data. Anastasios Nikolas Angelopoulos's Twitter Score is 38 out of 1000 as of September 2026, ranking #25,150 (top 10%) among 486,860 tracked accounts.

Anastasios Nikolas Angelopoulos co-founded Arena and serves as its CEO. The platform originated as a student project at UC Berkeley and allows users to compare and vote on responses from frontier AI models, generating preference data used to benchmark and improve those models. Anastasios Nikolas Angelopoulos co-authored the ICML 2024 paper describing Chatbot Arena as an open platform for evaluating large language models through human preference. His research focuses on the foundations of machine learning and statistics, with a particular emphasis on reliable AI.

Anastasios Nikolas Angelopoulos's work at Arena spans model-evaluation research across search-enabled AI, preference-proxy evaluation, multimodal models, and statistical extensions of Bradley-Terry and Elo models. Arena announced a $150 million Series A led by Felicis and UC Investments, with participation from Andreessen Horowitz, The House Fund, LDVP, Kleiner Perkins, Lightspeed Venture Partners, and Laude Ventures. Previously, Anastasios Nikolas Angelopoulos was a postdoctoral scholar at UC Berkeley and formerly worked as a student researcher at Google DeepMind.

Anastasios Nikolas Angelopoulos's account has 9,384 followers as of September 2026 and 3,004 posts. Anastasios Nikolas Angelopoulos has been mentioned by 24 accounts, with 46 total mentions.

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The accounts that follow Anastasios Nikolas Angelopoulos include 137 founders, 37 angel investors, 18 influencers and 3 VCs. Among them are Marc Andreessen, Shayne Coplan, John Wang, Tommy, Arjun Balaji and Jason.