OpenAI Codex is described as 'AI coding tool for automating code writing, editing, and task execution, supporting parallel tasks in secure sandboxes, with local and cloud agents for development' and is a ai coding assistant in the development category. There are more than 50 alternatives to OpenAI Codex for a variety of platforms, including Mac, Windows, Linux, Web-based and Visual Studio Code apps. The best OpenAI Codex alternative is Void, which is both free and Open Source. Other great apps like OpenAI Codex are Windsurf Editor, Cursor, Google Antigravity and opencode.