Arena Intelligence Inc., the startup behind a popular artificial intelligence model leaderboard, has raised $200 million in funding at a $3.1 billion valuation and plans to expand into measuring AI safety, tapping into growing demand to evaluate the technology’s performance and risks.The financing, set to be announced Thursday, was led by Lightspeed Venture Partners and Khosla Ventures, with participation from Salesforce Ventures and Dell Technologies Capital. The startup was previously valued a...