AI coding agentApache-2.0
Codex CLI
OpenAI's lightweight coding agent that runs in your terminal.
About Codex CLI
Codex CLI is a coding agent from OpenAI that runs locally on your computer. It installs through npm, Homebrew or prebuilt binaries for macOS and Linux, and signs in with a ChatGPT plan or an API key.
Summarised from the official pages linked above.
Guides
- AI-assisted game decompilation: matching decomps and ports with agents9 min
- Getting started with REA (Reverse Engineer Anything)9 min
- REA vs GhidraMCP vs IDA Pro MCP (and Binary Ninja MCP)8 min
- Set up an IDA Pro MCP server for Claude Code or Codex9 min
- What is AI-assisted reverse engineering?9 min
- Where AI goes wrong in reverse engineering, and how projects cope9 min
8 projects
Projects using Codex CLI
Works
Blog · Games and mods
Pick
500+ billion tokens: an agent swarm decompiled a first-person shooter
Fifteen agents, three months, 99% of a shooter rebuilt in C++.
Time About 3 months
宝玉
@dotey
@embirico @OpenAI How I Used Codex to "Recover" Lost Source Code in 5 Days Ever lost your source code? It's a terrible feeling. Years ago, I built an Electron drawing app. Then I lost the source code. All I had left was the compiled version. I thought about rewriting it from scratch, but the
X · Apps
Recovered the lost source of an Electron drawing app from its compiled bundle with Codex
Five days to turn an obfuscated bundle back into readable TypeScript.
Time 5 days
Partial
Blog · Games and mods
Started a ScummVM engine for the 1996 DOS game Harvester with Codex and GhidraMCP
A ScummVM engine for a 1996 horror adventure, started in about a day.
Time About a day for the first playable scenes
Works
Blog · Apps
Used Codex to reverse engineer the Codex CLI and call GPT-5-Codex-Mini directly
Codex reverse engineers its own CLI to reach a model before its API launched.
Model GPT-5-Codex
Used Codex CLI on something?
Share the writeup or repo, and what the AI got right and wrong.