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.