ChatGPT and Codex usage limits merging
OpenAI
Starting in December, Plus, Pro, and Business plans’ usage allowance will be shared across ChatGPT and Codex as we bring the agentic capabilities of Work into the main ChatGPT experience. Your usage for ChatGPT and Codex will be measured in tokens, the units of information a model processes and generates.
Summary drawn from OpenAI's own description of the story.