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claude-skill

opencodex: Switch Any LLM into Codex CLI, App & SDK Seamlessly

Leverage opencodex’s universal proxy to run any LLM through the Codex ecosystem—perfect for founders building AI‑powered products. 17k+ GitHub stars.
17,348 stars+345★ this week1,316 forksTypeScriptGuide quality 8/10 · reviewed Oct 5Updated 10/13/2026100% 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

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
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
Saves to your device
Use with Claude
New

Skip the builder — one click puts this in Claude, Cursor, Antigravity and more.

⚡ Runs out of the box

A prompt/skill package — nothing to install beyond adding it to your AI tool.

Try it instantly — no install
Claude Code
mkdir -p ~/.claude/skills/opencodex && curl -fsSL https://workflowstacks.com/api/skills/opencodex/claude-skill -o ~/.claude/skills/opencodex/SKILL.md
Open in another AI app

Opens the app with this repo with the prompt ready to go — no copy-paste needed.

Connect the whole catalog (MCP)
claude mcp add --transport http workflowstacks https://workflowstacks.com/api/mcp

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How opencodex: Switch Any LLM into Codex CLI, App & SDK Seamlessly works
Codeflow
Free to inspect

Opencodex: Switch Any LLM into Codex CLI, App & SDK Seamlessly is a very large TypeScript project (~448k lines across 1308 code files, plus 1392 test files). It is a full software project: use it through its install path rather than reading it end to end. Last commit this month, MIT license, has a test suite.

Size
Very large codebase
~448k lines · 1308 code files · days to read — use, don't read
Setup
Developer setup
A real software project. Use it via its install path; don't expect to read it all.
Runs on
Node.js · Docker
No API keys detected
TypeScript 98%CSS 1%
Where to start reading
  1. 1
    README.md
    Start here — what it does and how to install it
  2. 2
    AGENTS.md
    The instructions the AI actually follows
  3. 3
    src/cli.ts
    Where the program starts running
  4. 4
    package.json
    Dependencies and the commands it exposes
What's in each folder
src/Core code — the actual logic945 files
skills/Prompts, skills & agent definitions6 files
bin/Command-line entry points2 files
docs/Documentation48 files
devlog/Folder3901 files
gui/Folder607 files
docs-site/Folder572 files
scripts/Helper scripts59 files
READMEHas testsDocumentedCI checksDocker readyMIT licenseUpdated this month
Quick Actions
Details
Creator
lidge-jun
Language
TypeScript
Category
claude-skill
Published
6/18/2026

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Featured on WorkflowStacks
[![Featured on WorkflowStacks](https://workflowstacks.com/api/badge/opencodex.svg)](https://workflowstacks.com/skills/opencodex?utm_source=github&utm_medium=badge)
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