←back to thread

Show HN: Open Codex – OpenAI Codex CLI with open-source LLMs

(github.com)
106 points codingmoh | 2 comments | 21 Apr 25 17:57 UTC | HN request time: 0.433s | source

Hey HN,

I’ve built Open Codex, a fully local, open-source alternative to OpenAI’s Codex CLI.

My initial plan was to fork their project and extend it. I even started doing that. But it turned out their code has several leaky abstractions, which made it hard to override core behavior cleanly. Shortly after, OpenAI introduced breaking changes. Maintaining my customizations on top became increasingly difficult.

So I rewrote the whole thing from scratch using Python. My version is designed to support local LLMs.

Right now, it only works with phi-4-mini (GGUF) via lmstudio-community/Phi-4-mini-instruct-GGUF, but I plan to support more models. Everything is structured to be extendable.

At the moment I only support single-shot mode, but I intend to add interactive (chat mode), function calling, and more.

You can install it using Homebrew:

   brew tap codingmoh/open-codex
   brew install open-codex
It's also published on PyPI:

   pip install open-codex
Source: https://github.com/codingmoh/open-codex
1. siva7 ◴[21 Apr 25 20:04 UTC] No.43755874[source]▶
At least it can't be worse than the original codex using o4-mini.
replies(1): >>43755899 #
2. codingmoh ◴[21 Apr 25 20:07 UTC] No.43755899[source]▶
fair jab - haha; if we’re gonna go small, might as well go fully local and open. At least with phi-4-mini you don’t need an API key, and you can tweak/replace the model easily