Leaked code strings and screenshots circulating this week indicate that OpenAI is testing a new subscription service called ChatGPT Pro Max, priced at $500 per month, which is 25 times the cost of the existing ChatGPT Plus plan. This plan is primarily aimed at users who require faster processing speeds, with the speed-up limited to two of OpenAI's agent products: Work, which handles multi-step research and writing tasks, and Codex, which writes and debugs software code on its own. OpenAI has not yet publicly confirmed this news, but its annual developer conference, DevDay, is scheduled for September 29, and the market expects more details to be announced then.