In this video, OpenAI Codex Hacked: Use It with Gemini 2.5 PRO (The Best Coding Model), we explore how the open-source OpenAI Codex CLI has been modified to support Gemini 2.5 Pro—currently one of the top-rated models on the Chat LLM Arena. This hands-on walkthrough shows how you can use OpenAI Codex CLI with models beyond OpenAI, including a detailed setup guide using Node.js, API keys, and a real coding session to build a to-do app with a beautiful UI.

Try it yourself: https://github.com/ymichael/open-codex

You’ll see a complete demo of vibe coding OpenAI Codex style—prompting Codex to auto-generate a full Next.js app using ShadCN components. From initializing Codex CLI to handling context-aware prompts, this is your deep dive into OpenAI Codex handson use with cutting-edge models. We also compare OpenAI Codex vs Gemini 2.5, show Codex running in interactive and agent modes, and discuss real-world OpenAI Codex Python, Codex JavaScript sandbox OpenAI, and OpenAI Codex HTML code generation examples.

We’ll also touch on how to create AI OpenAI Codex, the OpenAI Codex activation process, and review how it stacks up against Copilot. Watch our OpenAI Codex reaction, hear the OpenAI Codex review, and see it work live in this real-world demo.

Try it out: test OpenAI Codex with Gemini, or compare it to OpenAI Codex alternative tools like Cursor AI or OpenAI Microsoft Codex demo environments.

Don’t forget to like, comment, and subscribe!