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

17 hours ago

Arena, an AI leaderboard provider that started as a UC Berkeley research project in 2023, reached $100 million in annualized run-rate revenue within eight months of commercial launch.
The company's primary product is a free crowdsourced AI model performance leaderboard, based on over 10 million user evaluations, where users compare responses from two models.
Revenue comes from AI Evaluations, a paid service launched in September offering deep-dive performance analytics to model labs and enterprises, though charges are based on consumption, not recurring subscriptions.
Arena competes indirectly with human labeling startups like Mercor, Surge, and Scale AI in the post-training optimization market, as AI providers seek to enhance model performance.
In January, Arena raised a $150 million Series A at a $1.7 billion valuation, with revenue at $30 million; gross revenue from AI training at other firms like Handshake and Mercor has also surged recently.
The platform evaluates models across tasks including text, coding, vision, image generation, and complex workflows via Agent Mode.
Co-founded by Anastasios Angelopoulos (CEO), Wei-Lin Chiang (CTO), and Ion Stoica, Arena has raised $250 million from investors including Felicis and Andreessen Horowitz.

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