Open Codex – OpenAI Codex CLI with open-source LLMs

Hacker News

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

Visit product View on Hacker NewsApr 21, 2025

Share card

Actual performance

106points

37comments

Made the leaderboard

Launch Intel predictions

Analyze your own launch →

Product HuntOn track for Day 1 leaderboard · Strong signals: model, codex, models · Missing: mac, agents, macos

95%95% predicted probability of success on Product Hunt, based on ML models trained on real launch data.

best fitHighest predicted score across all platforms for this description.

Indie HackersFits the IH revenue-focused audience · Strong signals: started · Missing: supports, reddit linkedin, podcasting

74%74% predicted probability of success on Indie Hackers, based on ML models trained on real launch data.

Hacker NewsStrong engagement from HN community · Strong signals: ide, io · Missing: https docs, excited, just released

72%72% predicted probability of success on Hacker News, based on ML models trained on real launch data.

nativeThis product was originally launched on this platform.

TrustMRRLess likely to generate early MRR · Missing: mobile apps, ios, personal

48%48% predicted probability of success on TrustMRR, based on ML models trained on real launch data.

AppSumoMay struggle as an AppSumo deal · Missing: plus, platform, intuitive

41%41% predicted probability of success on AppSumo, based on ML models trained on real launch data.

Acquire.comPre-revenue stage for this audience · Strong signals: active · Missing: arr, mrr, revenue

11%11% predicted probability of success on Acquire.com, based on ML models trained on real launch data.

BetaListMay not resonate with beta-testers · Strong signals: chat, introduce · Missing: web3, crypto, cryptocurrency

3%3% predicted probability of success on BetaList, based on ML models trained on real launch data.

Correct prediction on native model

Similar products

Poozle – open-source Plaid for LLMs65%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Poozle – open-source Plaid for LLMs

Hacker News132

Leaping – Open-source debugging with LLMs69%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Leaping – Open-source debugging with LLMs

Hacker News15

Keep – Open-source alerting CLI52%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Keep – Open-source alerting CLI

Hacker News65

An open-source API built on top of OpenAI Embeddings and Pinecone79%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

An open-source API built on top of OpenAI Embeddings and Pinecone

Hacker News5

CLI for Orthanc, an open-source DICOM server66%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

CLI for Orthanc, an open-source DICOM server

Hacker News2

Open-Source Library OpenAI/Azure Fallback Tool47%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Open-Source Library OpenAI/Azure Fallback Tool

Hacker News4

TensorZero – open-source data and learning flywheel for LLMs70%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

TensorZero – open-source data and learning flywheel for LLMs

Hacker News49

SlideSelection, an Open Source Hooper Selection Implementation47%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

SlideSelection, an Open Source Hooper Selection Implementation

Hacker News4

Piki is now open source73%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Piki is now open source

Hacker News2

Open Source CNC Beehive With Arduino and Sensors58%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Open Source CNC Beehive With Arduino and Sensors

Hacker News1

Browse all products Analyze your launch