Codex passes 4M weekly developers

OpenAI said this week that more than 4 million developers now use Codex every week, a new usage milestone the company tied to broader adoption inside software teams and enterprises. The figure appeared in a May 18 post announcing a partnership with Dell Technologies to bring Codex into hybrid and on-premises enterprise environments. OpenAI has also been pushing Codex beyond desktop setups, saying on May 14 that the product is now available in preview in the ChatGPT mobile app. The company says teams are using Codex for code review, test coverage, incident response and reasoning across large code repositories. ### Where does the 4 million figure come from? OpenAI’s April 21 enterprise update said Codex had grown from more than 3 million weekly developers in early April to more than 4 million just two weeks later. That same post said enterprises were moving quickly to put Codex into “real workflows across engineering and beyond.” OpenAI cited customers including Virgin Atlantic for test coverage, Ramp for code review and Notion for building new features. (openai.com) The May 18 Dell partnership announcement repeated the “more than 4 million developers” figure and described Codex as one of OpenAI’s fastest-growing enterprise products. OpenAI said companies are already using it across the software development lifecycle, from code review and test coverage to incident response and large-repository reasoning. (openai.com) ### What is Codex being used for inside engineering teams? OpenAI’s public descriptions now frame Codex less as a single autocomplete tool and more as an agent that can handle longer-running engineering work. The Codex product page says it is built for planning and building features, refactors, reviews and releases, with support for multi-agent workflows across projects. An April product post said the updated Codex app added computer use, in-app browsing, memory and plugins, along with developer-focused features such as reviewing pull requests, viewing multiple files and terminals, connecting to remote devboxes over SSH and using an in-app browser for local development. (openai.com) Those additions help explain the company’s emphasis on tasks such as incident response, repo-wide reasoning and test work rather than only code generation. (openai.com) ### What changed on mobile? OpenAI said on May 14 that Codex had begun rolling out in preview inside the ChatGPT mobile app on iOS and Android in supported regions. The company described the mobile experience as a way to monitor, steer and approve coding tasks while Codex keeps running on a laptop, Mac mini or remote environment. The same announcement said users can review outputs, approve commands, change models and start new work from a phone while files, credentials and permissions remain on the connected machine. (openai.com) OpenAI said updates flow back to the mobile app in real time, including screenshots, terminal output, diffs, test results and approvals. ### Why is OpenAI pairing Codex with Dell? (openai.com) OpenAI said on May 18 that its Dell partnership is aimed at enterprises that want Codex in hybrid and on-premises environments through Dell’s AI Factory and AI Data Platform. The post said Codex-powered agents are beginning to be used not only for engineering tasks but also to gather context across tools, prepare reports, route product feedback, qualify leads and coordinate work across business systems. (openai.com) Dell and OpenAI did not present new financial terms in the announcement, but the partnership gives OpenAI a route into companies that want tighter control over where models run and where code and internal data stay. That positioning matches OpenAI’s recent emphasis on enterprise deployment, mobile oversight and long-running agent workflows. (openai.com) ### What comes next? The OpenAI developer changelog lists the May 14 mobile release as the latest Codex app update and says ChatGPT mobile can connect to a Mac running the Codex app. A community post published the same day said Windows support for connecting a phone to the Codex app is “coming soon.” OpenAI’s next visible checkpoint is likely to be further rollout of those mobile controls and additional enterprise deployments through partners including Dell. (openai.com) As of May 19, the company’s public materials still describe the ChatGPT mobile integration as a preview release. (developers.openai.com)