This Wednesday morning, OpenAI's ChatGPT officially hits one billion global monthly active users, making it the fastest app ever to reach this milestone, according to both Gulf News and ZDNET. This achievement, approximately three years after its launch, underscores AI's rapid adoption.

OpenAI is simultaneously rolling out a GPT-5.5 Instant upgrade, offering improved response quality and a more natural, conversational writing style, while retiring older models like GPT-4.5 and o3 for paid users