Sam Altman Reveals Nearly All OpenAI Code Now Generated with AI at DevDay 2025

On Monday, October 6, 2025, OpenAI held its highly anticipated third annual DevDay event, where the company not only showcased its latest offerings for developers but also provided insights into its own internal use of AI for product development. The event highlighted OpenAI’s continued emphasis on integrating artificial intelligence into both the creation and enhancement of its software tools, reinforcing the company’s position as a leading innovator in AI-driven solutions.

During the event, OpenAI CEO Sam Altman made a striking revelation about the company’s internal development processes. He stated that “almost all new code written at OpenAI today is written by Codex users.” This statement underscores the growing reliance on AI-assisted coding within the organization itself. Codex, OpenAI’s cloud-based, AI agent-driven coding platform, is designed to help developers write code more efficiently by providing suggestions, automating repetitive tasks, and generating complex code snippets. The fact that OpenAI’s own engineers rely heavily on Codex to develop new products demonstrates the tool’s robustness, reliability, and transformative potential in software development workflows.

The DevDay 2025 event served multiple purposes: it was both a showcase of OpenAI’s latest developer-focused AI tools and a platform to provide transparency about how the company uses its own technology internally. By highlighting the use of Codex in writing nearly all new internal code, OpenAI illustrated a broader trend in the software industry: AI is increasingly becoming an indispensable tool for developers, not just as an assistive technology but as a central component of coding practices. The event emphasized that AI’s role is evolving from being a supplementary aid to becoming an integral part of the development lifecycle.

Alongside this revelation, OpenAI announced upgrades to Codex, reinforcing its position as a cutting-edge AI coding assistant. These improvements are likely aimed at enhancing Codex’s ability to understand context, provide more accurate code suggestions, and integrate seamlessly with cloud-based development environments. The upgrades demonstrate OpenAI’s commitment to continuous innovation and improvement, ensuring that Codex remains a reliable and powerful tool for developers worldwide. The AI agent-driven nature of Codex allows it to not only assist with code generation but also to anticipate developer needs, streamline complex coding tasks, and accelerate software delivery timelines.

Altman’s remarks during DevDay also sent a broader message to the AI and software development communities. By publicly acknowledging the extent to which OpenAI relies on AI for its own coding processes, he highlighted the practical benefits of adopting AI-driven coding solutions. Companies and developers observing OpenAI’s approach can see a real-world example of how AI can enhance productivity, reduce errors, and accelerate development cycles. Moreover, this transparency reinforces trust in AI technologies by demonstrating that even leading AI organizations rely on their own tools to maintain competitive advantage.

Overall, the October 6 DevDay event showcased OpenAI’s dual focus: expanding AI tools for external developers while simultaneously leveraging these tools internally to build new products efficiently. The revelation that almost all new code at OpenAI is now generated by Codex users underscores the transformative impact of AI on software development. The upgraded Codex platform, combined with the company’s commitment to AI-driven innovation, positions OpenAI as a key player in shaping the future of programming, where AI is not just a support tool but a central collaborator in the coding process. This event solidifies OpenAI’s vision of a future where artificial intelligence seamlessly integrates into the developer workflow, empowering programmers to work faster, smarter, and more creatively.