OpenAI Codex

by OpenAI
Open

OpenAI's agentic development tool: autonomous code writing and execution through a CLI and IDE agent, with GitHub integration and a sandbox for tasks.

Subscription Usage-based Extension Coding

Description

OpenAI Codex is an agentic programming tool. It works as a CLI agent and an IDE extension: it autonomously writes and runs code, integrates with GitHub and executes tasks in an isolated sandbox. The tool is part of ChatGPT plans.

Key features

  • A CLI agent for autonomous development
  • An IDE agent for editor work
  • GitHub and pull request integration
  • Task execution in an isolated sandbox

Access

There is no separate subscription: Codex is included in ChatGPT plans (Free, Plus, Pro, Business). Since 2026, usage is billed with token credits.

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