Harmonic Math's Aristotle AI Achieves Formally Verified IMO Gold Medal Performance, Valued at $875 Million

Palo Alto, CA – Harmonic, an artificial intelligence company, has announced that its Aristotle AI model achieved gold medal-level performance at the 2025 International Mathematical Olympiad (IMO). This achievement is particularly notable as Aristotle's solutions were formally verified using the Lean 4 proof assistant, distinguishing its approach from other AI models. The company, co-founded by Robinhood CEO Vlad Tenev and Tudor Achim, focuses on developing "Mathematical Superintelligence (MSI)" to deliver hallucination-free reasoning.

The news was highlighted by Satnam Singh, who recently met with Tudor Achim in Palo Alto, stating in a tweet, "Part of the Lean 4 proof that @HarmonicMath produced with its Aristotle system giving it Gold Medal-level performance at this year’s International Math Olympiad (IMO), printed on dot-matrix printer paper at their office in Palo Alto." This underscores the tangible, verifiable nature of Aristotle's mathematical outputs. The system translates natural language math problems into Lean 4, solves them, and provides formally verified proofs.

Harmonic recently secured $100 million in Series B funding in July 2025, led by Kleiner Perkins, which propelled the company's valuation to approximately $875 million. This significant investment follows a $75 million Series A round in September 2024, reflecting strong investor confidence in Harmonic's innovative approach to AI. The capital is intended to accelerate the development and deployment of Aristotle.

Unlike other AI models from Google and OpenAI that also achieved gold medal performance in the 2025 IMO through informal natural language tests, Aristotle's results were obtained via formal testing, where problems were translated into a machine-readable format. Tudor Achim, CEO and Co-Founder of Harmonic, emphasized that Aristotle's algorithmic innovations yielded "formally verified solutions to complex, novel mathematical problems." This rigorous verification process ensures accuracy and eliminates the common issue of AI hallucinations.

The launch of Aristotle as an iOS and Android app, alongside web and API access, aims to make this advanced mathematical reasoning tool widely available. The company's focus on formal verification positions Aristotle as a reliable solution for high-stakes applications requiring absolute accuracy. This development signals a significant advancement in the field of AI, particularly in machine learning for mathematics and formal verification for software and hardware.