Show HN: Open Codex – OpenAI Codex CLI with Open Source LLMs

Open Codex

Open Codex CLI (19659002)

Lightweight coding agent for your terminal

brew tap codingmoh/open-codex

brew install open-codex

Open Codexis a fully-open-source command-line assistant inspired by OpenAI Codex. It supports local language models such as phi-4-mini.

No API key required. All local.

Supports:

• One shot mode : opens-codex "list all folders" -> returns shell command.
• Only local execution with supported OS models currently phi-4-mini

Features

• Natural Language Command to Shell Command (via Local Models)
• Works with macOS, Linux and Windows (Python based)
• Confirmation Before Execution
• Add To Clipboard / Abort / Execute Prompt
• Interaction mode for one-shot (interactive and functions-calling will be available soon)
• Colored Terminal Output

  Future Plans

  • Interactive and context aware mode.
  • Fancy UI with textual rich
  • Support for additional OSS Models.
  • Full interactivity chat mode.
  • Support for function-calling.
  • Voice Input via Whisper.
  • Command History and Undo.
  • Plugin System for Workflows.

    Installation

    Option 1: Install via Homebrew for MacOS (Recommended)

    brew tap codingmoh/open-codexbrew install open-codex

    Option 2: Install via pipx (cross-platform)

    Option 3: Clone & Install local

    git clone https://github.com/codingmoh/open-codex.gitcd open_codexpip install .

    Once installed, the open-codex command-line interface can be used globally.

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    Usage

    One-shot mode (#19659034)

    open-codex "untar file abc.tar"

    Codex suggests a command for the shell
    Requests confirmation / adds to clipboard / aborts
    Executes when approved

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    Security Notice

    All models are run locally. Only after explicit approval can commands be executed.

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    Contributing

    We welcome PRs! Ideas, issues, and improvements are all welcome!

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    License

    With

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    Built with love and coffee by codingmoh.