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OpenAI
2026-10-19 01:33:19

How Codex went from a failed cloud debut to the shell beneath ChatGPT desktop

OpenAI’s Codex has emerged as one of the company’s most consequential product stories, and a long-form report by Every CEO Dan Shipper lays out how that happened in detail. Based on interviews with OpenAI co-founder Greg Brockman and six core Codex team members, the report traces Codex from an early cloud-first launch that struggled to gain traction to a local-agent pivot, a rebuilt core architecture, and eventually a desktop app that became the foundation for ChatGPT’s desktop experience. The account points to several turning points. The first Codex Cloud, released in May 2025 after roughly seven weeks of work, ran into two problems at once: developers faced difficult real-world environment setup, and the model itself was not yet strong enough to handle complex tasks independently. OpenAI then revived a local path it had previously sidelined, rebuilt the underlying agent in Rust, and paired it with stronger post-trained GPT-5 coding models. By October 2025, Codex usage had grown more than 10x, with IDE extensions overtaking the terminal as the main entry point. The next shift was even bolder. Rather than doubling down on the terminal and IDE alone, the team built a native desktop app designed to manage multiple agents at once, and deliberately left out a code editor. That bet only worked after newer Codex models improved. The desktop app launched on Feb. 2, 2026, reached more than 2 million weekly active users in March and more than 5 million by June, and later merged with the ChatGPT desktop experience in July.

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How Codex went from a failed cloud debut to the shell beneath ChatGPT desktop
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