OpenAI has crossed a major milestone, saying more than 1 billion people and 2 million businesses now use its AI models as it cuts prices to bring more customers on board. “Our models now reach more than one billion active users and more than two million businesses. Price cuts aim to expand adoptionThe milestone comes just days after OpenAI reduced prices for two GPT-5.6 models. Luna now costs $0.20 per million input tokens and $1.20 per million output tokens, while Terra costs $2 and $12, respectively. Open-source AI models, including several from China, have also added pressure by offering lower-cost alternatives for businesses and developers.