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

On October 6, OpenAI showcased its latest AI tools for developers and revealed that it heavily relies on AI to create its own products. At the third annual DevDay event, CEO Sam Altman stated that “almost all new code written at OpenAI today is written by Codex users.” The event highlighted upgrades to Codex, OpenAI’s cloud-based, AI agent-driven coding tool, emphasizing how AI is now integral to both developing and enhancing OpenAI’s offerings. This move illustrates OpenAI’s commitment to leveraging AI not just as a product but as a core tool in its own software development processes.