OpenAI Codex

OpenAI's software engineering agent in the cloud, terminal or IDE.

Features

OpenAI Codex is paid (a trial is sometimes available).

Updated on October 31, 2026

by GitHub

Freemium

In-editor coding assistant with an agent that can handle issues.

by Anysphere

Freemium

AI-first code editor: completion, chat and agents across your codebase.

by Anthropic

Paid

Agentic coding tool that works in your terminal and repositories.

by Windsurf

Freemium

Code editor with the “Cascade” AI agent that understands your project.

by Replit

Freemium

Build and deploy apps by describing them to Replit Agent.

by Amazon Web Services

Freemium

AWS agentic IDE that goes from specs to production code.

What is OpenAI Codex?

OpenAI Codex (OpenAI) : OpenAI's software engineering agent in the cloud, terminal or IDE.

Is OpenAI Codex free?

OpenAI Codex is paid (a trial is sometimes available).

What are the alternatives to OpenAI Codex?

GitHub Copilot, Cursor, Claude Code, Windsurf, Replit, Kiro.