Codex is switching to API pricing based usage for all users (help.openai.com) AI

OpenAI’s Codex rate card has been updated: as of April 2, 2026, Codex pricing for new and existing ChatGPT Business customers and new ChatGPT Enterprise plans shifts from per-message estimates to token-based usage (credits per million input, cached input, and output tokens). The article provides separate legacy rate cards for Plus/Pro and most other plans until migrations are completed, with users advised to review both during the transition.