OpenAI has just slashed what it charges for two GPT-5.6 models, a move announced one day before the company revealed that its models now reach more than one billion active users. Within a human-led process, GPT-5.6 Sol autonomously rewrote and optimized production GPU kernels, work that helped reduce its end-to-end serving costs by 20%. Friar disclosed the next day that OpenAI's models now reach more than one billion active users and more than two million businesses. The company didn't specify whether the latest figure represents weekly or monthly users, but given its previous announcement that ChatGPT had more than 900 million weekly users, it's likely the former. OpenAI generated $13.07 billion in revenue during 2025 but lost $21 billion, while only around 50 million of its then-900 million weekly users paid for a subscription.