How Codex ran OpenAI DevDay 2025

What this post added

This post highlights the pervasive use of Codex, an AI coding assistant, in building and executing various components for OpenAI DevDay 2025. It showcases how Codex was instrumental in controlling hardware (cameras, lights), developing rich user interfaces (beat pad, arcade games), rebuilding demo applications, generating diagrams, and managing documentation. Codex's capabilities in code generation, debugging, parallel task execution (via CLI and IDE extensions), and rapid iteration significantly accelerated development cycles and enabled the creation of complex features that would have been time-prohibitive otherwise. This demonstrates a significant advancement in the practical application of AI for agentic development and deployment.