claude-skill

Use Any LLM with opencodex

Name: Use Any LLM with opencodex
Author: lidge-jun

Get universal access to LLMs with opencodex, a proxy for startup founders, 241 GitHub stars

12,763 stars942 forksTypeScriptHealth Score 8/10Updated 9/1/2026100% free · open source

What it does

Opencodex allows startup founders to use any large language model with the OpenAI Codex CLI, App, and SDK, providing universal access to LLMs through a proxy

Install / run

git clone https://github.com/lidge-jun/opencodex.git && cd opencodex

When to use it

•When you want to switch between different LLMs without changing your application code
•When you need to use a specific LLM that is not natively supported by the Codex CLI or App
•When you want to test and compare the performance of different LLMs with your application

Quick start

1Create a configuration file `config.json` in the project root with your LLM provider settings
2Run `npm install` to install the required dependencies
3Start the opencodex proxy server with `npm run start`
4Use the `codex` command-line tool with the `--proxy` option to point to your opencodex server, for example: `codex --proxy http://localhost:8080 complete 'Hello World'`
5Verify that the opencodex proxy is working correctly by checking the logs and the response from the LLM

Ready-to-paste prompt

codex --proxy http://localhost:8080 complete 'Create a Python function to calculate the factorial of a given number'

Heads up: Make sure you have a valid API key for your chosen LLM provider and that it is correctly configured in the `config.json` file, as opencodex will not work without a valid API key

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