This article outlines how the Sora Android app was developed in just 28 days using Codex. It discusses the challenges and advantages of integrating Codex into the engineering workflow, emphasizing the importance of clear guidance and context for effective collaboration.

The Codex app transforms how developers interact with AI agents, enabling them to manage multiple tasks and collaborate effectively. It offers new skills that extend beyond code generation, allowing Codex to perform a variety of tasks on a computer. Developers can customize their interactions with Codex, choosing between a direct or conversational style.

The article discusses the differences between Codex and Claude Code, two AI coding tools, highlighting their respective strengths and user preferences. It emphasizes that the choice between them should reflect individual working styles rather than a one-size-fits-all solution. The author encourages experimenting with both tools to find the best fit.

Codex has introduced several new features including a new extension for popular development tools, an improved CLI for local environments, and enhanced task management capabilities that integrate local and cloud tasks. The updates, which leverage GPT-5, also include support for Codex-driven code reviews in GitHub, marking a significant advancement in developer productivity.

OpenAI has launched Codex, a coding tool designed for developers to delegate simple programming tasks to an AI agent that generates production-ready code. Accessible via the ChatGPT web app, Codex operates within a user’s development environment and can be customized through an “AGENTS.md” file for improved effectiveness. Built on a fine-tuned model, Codex leverages reinforcement learning to enhance its coding capabilities.