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Shape how the world trusts AI

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Arena believes that AI must benefit people. Our core thesis is simple: to align AI with human value, we must directly measure its impact on people in the real world.

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The Arena office environment

Our Story

Created by researchers from UC Berkeley SkyLab, Arena is a community-powered platform for understanding AI performance in the real world. We build the public leaderboard that the AI industry relies on to measure progress.

Our investors include Andreessen Horowitz, Felicis, Kleiner Perkins, Laude Ventures, LDVP, Lightspeed Venture Partners, The House Fund, and UC Investments (University of California).

  • Anastasios AngelopoulosCo-founder/CEO
  • Wei-Lin ChiangCo-founder/CTO
  • Ion StoicaCo-founder/Chairman

Our Core Values

Maximize P(Win)

“Maximize the Probability of Winning”: our decision making framework. In every decision, we weigh tradeoffs, assess risk, and choose the path that maximizes the probability that Arena succeeds. We set aside our emotions and make tough decisions in order to maximize P(Win). “Maximize P(Win)” frees us from constraints and clarifies that we must put Arena first.

Own the Outcome

We own results end to end — not just our individual slice of the work. When problems arise and we have the means to act, we do so without waiting for permission or assignment. We treat failure and success as signals and use them to improve. At Arena, we stay accountable to the final outcome.

Elevate Others

Steel sharpens steel. By bringing our best selves to work, we push each other to learn and grow. We expect excellence from one another because we respect each other. We elevate others as opposed to ourselves: no hoarding of responsibilities, no ego, and a healthy disregard for hierarchy.

Open Roles

    Benefits built for builders at the frontier

    • Top-Tier Team

      Built on experience from Berkeley SkyLab, Stanford, Google, SpaceXAI and beyond

    • Health & Wellness

      Comprehensive medical, dental, and vision coverage for you and dependents

    • Generous PTO

      Take the time you need to recharge. We trust you to manage your energy

    • AI Tokens

      Get access to all the tokens you need and the AI tools you love to help you move fast

    • Competitive Comp

      Salary + meaningful equity in a fast-growing company backed by top investors

    • Learning Budget

      Annual stipend for conferences, courses, and books to keep growing

    In the news

    Arena, the AI leaderboard everyone uses, is now a $100M business

    Just eight months after launching its commercial service, AI leaderboard provider Arena, which originated as a research project at UC Berkeley in 2023, has reached $100 million in annualized run-rate revenue.

    News
    Tech Crunch

    What Are A.I. Agents Actually Doing

    A San Francisco start-up called Arena found that people are most likely to use A.I. agents for programming, research and travel planning.

    News
    New York Times

    AI Evaluation Startup LMArena Valued at $1.7 Billion in New Funding Round

    By Katie Roof and Rocket Drew

    News
    The Information

    Arena AI CEO says enterprises don’t know which AI models to trust

    Arena CEO Anastasios Angelopoulos said companies are “terrified” of working with frontier AI companies and China-based open models.

    News
    Business Insider

    The Top 100 Gen AI Consumer Apps — 6th Edition

    Three years ago, we published the first edition of this list with a simple goal: identify which generative AI products were actually getting used by mainstream consumers.

    News
    A16Z
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    Featured Roles

    • Software Engineer - Product Security SecuritySF Bay AreaFull-Time
    • Software Engineer - Data Infrastructure EngineeringSF Bay AreaFull-Time
    • Software Engineer - Full Stack EngineeringSF Bay AreaFull-Time
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    • Software Engineer - Platform EngineeringSF Bay AreaFull-Time
    • Member of Security Staff, Privacy & Trust Ops Lead SecuritySF Bay AreaFull-Time
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    View all 19 open roles