SAN FRANCISCO, May 22, 2025 — In a landmark move set to transform the way AI models are evaluated, LMArena, the leading open community platform for AI model assessment, has secured $100 million in seed funding. The round was led by a16z (Andreessen Horowitz) and UC Investments, with participation from a powerhouse of notable investors including Lightspeed Venture Partners, Laude Ventures, Felicis Ventures, Kleiner Perkins, and The House Fund.
The funding coincides with the upcoming relaunch of LMArena’s fully rebuilt platform next week — promising a faster, sharper, and community-centric hub for rigorous, transparent, and human-centered AI model evaluation.
Building Critical Infrastructure for Trustworthy AI:
In an industry advancing at breakneck speed, LMArena is laying down essential infrastructure: an impartial, reproducible, and community-driven platform for evaluating how AI models perform in real-world applications. Already, the platform has facilitated over 400 model evaluations and gathered 3 million+ community votes, shaping the performance insights of AI systems from industry giants like Google, OpenAI, Meta, and xAI.
“In a world racing to build ever-larger AI models, the crucial question is no longer ‘what can AI do’ — it’s ‘how well can it do it, for whom, and in what context,’” said Anastasios N. Angelopoulos, co-founder and CEO of LMArena. “We’re building the infrastructure to answer those questions reliably.”
The upcoming platform refresh brings a rebuilt UI, a mobile-first design, reduced latency, and powerful new features including saved chat history and continuous conversations. The legacy site will remain live temporarily, but all innovation and future development will migrate to lmarena.ai.
Trusted by the Best, Driven by Principles:
What differentiates LMArena isn’t just its platform but the transparent, principled framework it operates on. All model evaluations are open, leaderboard mechanics are public, and models are tested with diverse, real-world prompts to gauge nuanced, practical performance.
“AI evaluation has too often lagged behind rapid model development,” said Ion Stoica, co-founder at LMArena and professor at UC Berkeley. “We’re closing that gap with a rigorous, community-led platform grounded in long-term integrity.”
The vision extends beyond evaluation — the platform is already partnering with leading AI providers to uncover detailed performance trends, gather human preference data, and stress-test model updates under real-world conditions.
A Long-Term Vision for AI Accountability:
Investors backing LMArena emphasize its vital role in securing AI’s future.
“We invested because the future of AI hinges on reliability and trust,” said Anjney Midha, General Partner at a16z. “And that requires transparent, scientific, and community-led evaluation. LMArena is building exactly that.”
Jagdeep Singh Bachher, CIO at UC Investments, added: “We’re excited to see academic innovation from university labs like those at UC Berkeley making a real-world impact through platforms like LMArena.”
About LMArena:
LMArena is an open-access, community-driven platform designed to rigorously evaluate AI models through real-world prompts and transparent methods. By enabling developers, researchers, and users to vote on and compare model outputs, LMArena creates a scientific, reproducible, and trust-centric infrastructure for advancing reliable AI systems. Its mission is to ensure AI isn’t just powerful, but also trustworthy, safe, and aligned with human needs.
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