OpenAI shifts to Codex tooling

OpenAI is making GPT-5-codex the standard brain for Codex, putting the coding-focused model at the center of its cloud developer tools. (help.openai.com) OpenAI said last week that GPT-5-codex is now the default model for cloud tasks and code review in Codex. The company also said developers can pick it for local work through the Codex command-line interface and the integrated development environment extension. (help.openai.com) Codex is OpenAI’s coding agent, which means software that can read, edit, and run code instead of only suggesting snippets. OpenAI’s developer docs say the terminal-based Codex command-line interface runs on a local machine, while the Visual Studio Code extension can work side by side in an editor or send jobs to Codex Cloud. (developers.openai.com, developers.openai.com) The shift gives OpenAI one named coding model across cloud reviews, delegated tasks, and local developer workflows. OpenAI repeated the same GPT-5-codex rollout in release notes for ChatGPT Business, ChatGPT Enterprise and Edu, and general ChatGPT updates dated April 2026. (help.openai.com, help.openai.com, help.openai.com) OpenAI is also pruning older Codex model choices. In the Codex changelog, OpenAI said the picker stopped showing several older models on April 7, 2026, and said those models would be removed from Codex for ChatGPT sign-in on April 14, 2026. (developers.openai.com) That changelog also introduced a cheaper GPT-5-codex-mini option for the Codex command-line interface and integrated development environment extension. OpenAI said the smaller model gives about four times more usage than GPT-5-codex as part of a ChatGPT subscription. (developers.openai.com) The product changes extend beyond model names. OpenAI’s Business release notes said the company cut subscription-based ChatGPT seat prices by $5 a month and updated the Codex rate card to match token-based usage pricing, while keeping ChatGPT rates unchanged. (help.openai.com) Reports about a broader Codex app remain less settled. Aitoolsbee, citing TestingCatalog, reported on April 11, 2026 that OpenAI is testing a desktop Codex app that combines ChatGPT, Atlas, and coding tools around a persistent workspace called Scratchpad, but OpenAI has not published that product on its official sites. (aitoolsbee.com) OpenAI’s own docs point in the same direction on one narrower fact: Codex is now available across ChatGPT Plus, Pro, Business, Edu, and Enterprise plans, and the company’s learning pages pitch it as a tool for building, testing, reviewing, and shipping code. The immediate change is simpler than the rumors: when OpenAI talks about coding now, it is increasingly talking about Codex first. (help.openai.com, developers.openai.com)