lmarena.ai (formerly chat.lmsys.org) is a website for you to compare LLM responses. It was launched in 2023 at UC Berkeley, separated in September 2024, became a company in April 2025, and raised a $100M funding round in May 2025.

Resolves YES if lmarena.ai implements any sustainable form of monetization or revenue generation by June 30, 2026, and NO otherwise. "Sustainable form" means that it keeps on generating revenue repeatedly (i.e. one-off funding doesn't count). This could include (but is by no means limited to!) things like fees, subscriptions, advertisements, or sponsorships.