OpenAI is developing a new subscription plan named ChatGPT Pro Max, with a monthly fee of $500. According to code references and screenshots that have been circulating this week, this price is 25 times that of the $20 ChatGPT Plus plan and also twice that of the $200 Pro plan. Independent researcher Tibor Blaho is one of the first to discover this change; he found relevant information in a series of hidden logs. OpenAI has not yet publicly confirmed the details of the Pro Max plan, but it is expected that more information will be released at the DevDay conference on September 29th.