According to TestingCatalog, a tech information tracking account, OpenAI is preparing to launch a ChatGPT subscription plan called "Pro Max," priced at $500 per month, and potentially powered by Cerebras infrastructure. The main difference between this plan and the existing Pro plan is the addition of "Fastest Work and Codex" features, with usage limits possibly further increased. OpenAI has not officially confirmed this news, and more details may be revealed at OpenAI DevDay 2026, scheduled for September 29 in San Francisco, though this is merely a speculation by the account.