On September 29, OpenAI unveiled a series of new products and features tailored for developers, enterprises, and power users at the DevDay 2026 developer conference. Among them, the most notable is the introduction of the $500-per-month ChatGPT Pro 500 plan. Meanwhile, the usage quota for the existing $200-per-month Pro 200 plan will be reduced. Additionally, OpenAI has implemented significant upgrades to Codex, Agents API, and the API platform.
