This tool color-codes code diffs based on the level of human attention they require. By replacing "github.com" with "0github.com" in a pull request URL, users can visualize which changes might need a closer look. It uses AI to analyze the code and generates a heatmap highlighting potential issues.

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.