OpenAI Codex
OpenAI's coding agent for the web, CLI, IDE and iOS, included in ChatGPT plans.
Included in Free, Go ($8/mo), Plus ($20/mo) and higher ChatGPT plans; limits vary by plan. Checked 2026-10-14.
Quick start
Install the CLI, sign in with ChatGPT, and give it one small, testable task in your repo.
Good and not so good
- Included in ChatGPT plans
- Cloud code review on Plus
- Usage shared with ChatGPT Work
Use cases with OpenAI Codex
Run a solo content team with agent skills
Runs Opus 5.5 in Claude Code as editor-in-chief over nine skill sets that cover topics, writing, visuals, video editing, sound and scheduling.
Use a video editor your agent can drive
After a $137 Adobe cancellation fee, built AIVidMaker, an open-source editor that Claude Code, Codex, Cursor or Grok Bot can control.
Wake up to pull requests your agents finished overnight
Uses Firstmate so one agent in Claude Code orchestrates other coding agents overnight.
Measure what your AI assistant is actually worth
Built an ROI tracker that turns a month of AI assistant activity into plain business metrics.
Design a game UI with Codex image generation
Built a card game UI using image generation in Codex together with Claude Code to avoid the usual AI look.
Try replacing your SaaS stack with vibe-coded tools
Set out to replace his whole tech stack with vibe-coded alternatives using Claude Code, and documented where it fell short.
Generate complete Godot games from a prompt
Built Claude Code skills that take a text prompt, design the architecture, generate 2D and 3D assets, write GDScript and test the game.
Build your own social media management tool
Built Brightbean Studio, a social media management tool, in three weeks with Claude and Codex.
Control Ableton Live by asking your agent
Made an MCP server so Codex can do anything in Ableton Live while the author was stuck holding a sleeping baby.
Get deeper multi-agent PR reviews
A Claude Code plugin runs multi-stage PR reviews with parallel sub-agents, validation passes and optional Codex ensemble review.
Turn a sketch into a 3D-printable toy
Turned a sketch into a 3D-print model of a small pegboard for his kid with an AI agent instead of CAD by hand.
Turn your personal website into a playable game
Rebuilt the Halo 3 map Guardian to run in the browser and hid a treasure hunt through his life inside it.
Make AI character videos from your build log
Claude wrote the script, Codex drew 13 faces and Chatterbox cloned his voice from 11 seconds of audio.
Recreate an app animation you admire
Saw a card animation in the Vivino app and built a similar swipe effect with Codex for his own app.
Build your first games as a designer, not a game dev
A 25-year designer built six games with Claude Code and Codex; getting them running was quick, making them fun took longer.
Hand repeatable business routines to an agent
A founder running $20M+ businesses rates Grok Bot top tier because it reliably runs repeatable routines.
Run your coding agents from your phone by voice
Use OpenClaw as a delegator for CLI coding agents so you can drive everything from voice notes on your phone.