Arena Hits $3.1B as AI's Referee

🔥 What happened Arena raised a $200M Series B at a $3.1B valuation, led by Lightspeed and Khosla. The Berkeley spinout doubled its worth in ten months while revenue jumped from $30M to $100M ARR. 💡 Why it matters Labs spent years grading their own homework. Arena now sells neutral measurement as a product, including a new alignment leaderboard that punishes lying and unauthorized actions. OpenAI currently tops it; Claude sits at sixth and ninth. ⚡ Our take Whoever writes the exam owns the game. Arena is becoming the antitrust authority of AI — and the labs happily pay to get graded.