Arena, the AI leaderboard everyone uses, hits $100M in annualized revenue

What's the deal? Arena — the crowdsourced AI model leaderboard that major labs rely on — has reached $100 million in annualized run-rate revenue, just eight months after launching its commercial service. Arena was valued at $1.7 billion at its $150 million Series A in January 2026.

Originating as a UC Berkeley research project in 2023 (Chatbot Arena), the platform is best known for its free leaderboard, built from over 10 million user evaluations — users type a prompt sent to two anonymous models, then vote on the better response.

Why now? Arena began making money in September 2025 when it launched AI Evaluations, selling model labs and enterprises deep-dive performance analytics drawn from its community. "A lot of people don't even understand that our business is making any money at all; people still see us as like an open-source project," co-founder and CEO Anastasios AngelopoulosDealroom has a profile for this one. Try Dealroom → told TechCrunch.

The company calls the milestone ARR, though Angelopoulos clarified it charges for consumption, so the revenue isn't strictly recurring.

What it means. Arena has no direct leaderboard competitor since Yupp shut down in March 2026, but says it competes "for the same dollar" with human-labeling startups like Mercor, Surge AI and Scale that help labs refine models in post-training — a market where demand is surging as labs chase performance.

Alongside Angelopoulos, Arena was co-founded by CTO Wei-Lin ChiangDealroom has a profile for this one. Try Dealroom → and UC Berkeley professor and Databricks co-founder Ion StoicaDealroom has a profile for this one. Try Dealroom →. The startup has raised $250 million to date from backers including Andreessen Horowitz, Felicis, Kleiner Perkins, Lightspeed Venture Partners and UC InvestmentsDealroom has a profile for this one. Try Dealroom →.

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