Just eight months after launching its commercial service, AI leaderboard provider Arenawhich began as a research project at UC Berkeley in 2023, has reached $100 million in annual run-rate revenue.
Arena is best known for its popular crowdsourced AI model performance leaderboard, created from over 10 million user ratings. Its consumer site allows a user to type in a prompt that it sends to two models. The user then selects which model did a better job.
While Arena’s popular AI model leaderboard is free for public use, the company began monetizing its platform in September when it introduced AI reviewsa service that provides model labs and businesses with performance analytics collected from its community.
Arena’s rapid revenue growth shows that its commercial offerings are popular with both customers and its evaluator community, who are often drawn to the platform for early access to the latest, often unreleased, AI models.
“A lot of people don’t even understand that our business makes any money at all; people still see us as an open source project,” Arena co-founder and CEO Anastasios Angelopoulos told TechCrunch.
While Arena calls the revenue milestone ARR, a term that has traditionally been annual recurring revenue, Angelopoulos clarified that the company charges customers for “consumption,” meaning its revenue is non-recurring.
While Arena has no direct competitors — Yupp, another AI model collection startup, shut down in March — Angelopoulos said the company competes “for the same dollar” with startups like Mercor, Surge and Scale AI, which help modelers improve their AI during post-training.
As AI providers strive to maximize model performance, their appetite for post-training enhancement services continues to grow. When Arena announced in January that it had raised a $150 million Series A at a post-money valuation of $1.7 billion, its annual revenue was $30 million.
Elsewhere, Handshake’s annual gross revenue from AI training has nearly doubled since January, from $550 million to nearly $1 billion, The Information was mentioned in April. Mercor’s annual revenue also topped $1 billion earlier this year, up from $500 million last September. according to in The Information.
Arena ranks models across a variety of tasks including text, coding, vision and image generation, as well as complex, long-running workflows through its recently introduced Agent Mode.
Along with Angelopoulos (pictured left), Arena was co-founded by fellow UC Berkeley postdoctoral fellow Wei-Lin Chiang (pictured center), who serves as the startup’s CTO. The startup was also founded by Ion Stoica (pictured right), the renowned UC Berkeley professor and co-founder of Databricks, who advised the project before it was incorporated as a company in April 2025.
Arena has raised a total of $250 million from investors including Felicis, Andreessen Horowitz, The House Fund, LDVP, Kleiner Perkins, Lightspeed Venture Partners, Laude Ventures and UC Investments.
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