OpenAI on April 9 introduced a new $100/month ChatGPT Pro subscription sitting between the existing $20 Plus and $200 Pro tiers, offering five times the Codex usage of Plus and targeting developers running extended autonomous coding sessions; through May 31 subscribers receive ten times as a launch incentive. The update also quietly rolled out GPT-5.3 Instant Mini as the new fallback model users reach after hitting rate limits on GPT-5.3 Instant, replacing GPT-5 Instant Mini with a version described as delivering more natural conversation and stronger contextual awareness. Both moves come as Codex reached three million weekly active users—a fivefold increase in three months—with OpenAI generating roughly $2 billion in monthly revenue and over 50 million paid subscribers.