OpenAI Codex
by OpenAI
OpenAI's coding agent for the terminal, IDE and cloud, included with ChatGPT plans.
About
Codex is OpenAI's software engineering agent. It can work on tasks in a cloud sandbox, in your IDE or through the open-source Codex CLI, and can propose its changes as pull requests.
Useful features
- Cloud tasks that run in parallel
- Open-source Codex CLI (Apache-2.0)
- IDE extension
- Code review on pull requests
Good for
- Delegating well-defined coding tasks
- Working in the terminal
- Reviewing pull requests
Pricing
Check pricing. Codex comes with ChatGPT plans rather than as a standalone product, and its usage moved to token-based credits in 2026. Plan details change often, so check OpenAI's site.
More in Coding
-
#1
Claude Code (moving up)
Agentic coding tool that works in your terminal, IDE, desktop app or browser.
-
#2
Cursor (moving up)
AI-first code editor with autocomplete, chat and agents that edit across your codebase.
-
#3
AI pair programmer in your editor, on GitHub.com, in the terminal and in pull requests.
-
#5
Browser-based workspace where an AI agent builds, runs and publishes apps.
-
#6
Open-source command-line agent that brings Gemini models into your terminal.