This market will resolve to "Yes" if ChatGPT reaches 1 billion monthly active users (MAUs) during by December 31, 2025, 11:59 PMET. Otherwise, this market will resolve to "No." The primary resolution source will be official information from OpenAI, however a consensus of reputable sources including, major analytics firms (e.g. Similarweb, Sensor Tower), investor or regulatory disclosures, or reputable media may also be used.