01What is Codex Voice and How Does It Work?

Codex voice is a new feature inside OpenAI's Codex terminal tool that lets you talk to code, build websites, apps, and tools using your voice. Instead of typing commands, you speak, and Codex listens and writes the code for you.

In this episode, Julian Goldie shows how Codex voice turns your computer into a personal assistant like JARVIS. You open your terminal, say what you want, and watch the code appear on your screen. The system uses your Codex agent to do the work, and it feels simpler than using the Codex app.

The voice works in real time, so you can give a command, get a response, and give the next one. It's built for speed and ease, especially for coding tasks.

02Main Features of Codex Voice

Codex voice brings several useful features to your terminal. Here are the key ones Julian highlights:

  • Voice input for coding – Say what you want to build, and Codex writes the code.
  • Real-time feedback – You can ask Codex how it thinks about the design and get answers.
  • Simple start and stop – Type 'voice' to start, '/voice stop' to end.
  • Interruption support – You can stop and restart a voice session easily.
  • Integration with Codex agents – The voice works with your existing Codex setup, so you don't need extra tools.

Julian notes that previously you could do voice in the Codex app, but the terminal version feels smoother and more straightforward. It's a dedicated place for voice control.

Another big plus: no need to plug in an API key. That makes it 10 times easier to run, according to Julian.

03How to Get Started with Codex Voice

Getting started with Codex voice is quick. Julian shows the exact steps in the episode:

  1. Make sure you have Codex installed locally on your computer.
  2. Sign into your Chatsheepity account (that's the transcript's spelling; it's really ChatGPT).
  3. Check that you are on a Plus or Pro plan, as the feature may only be available for those.
  4. Open your terminal.
  5. Update Codex to the latest version to ensure you have the voice feature.
  6. Type 'voice' to start a voice session.

Once you type 'voice', you can begin speaking your commands. For example, you can say 'Build out a fitness app for me' and Codex will respond and start working.

To stop the voice session, type '/voice stop'. To interrupt it, you can use keyboard commands to stop and then switch back to voice.

04How to Use Codex Voice for Building Apps

Using Codex voice is straightforward. In the episode, Julian demonstrates building a website for a boarding company just by talking. He says, 'I want you to build out a new website for the aircraft for boarding using voice,' and Codex goes off and codes it.

Then he asks, 'How do you think about the design so far?' and Codex gives feedback on the design. This shows you can have a back-and-forth conversation about your project, not just give one-time commands.

For bigger tasks, like building a fitness app, you can say, 'Hey, can you build out an app for fitness for me please?' Codex responds with 'Sure thing. Let's get it rolling.' and starts working.

He also tests asking Codex to change its voice. Codex replies that it can't change its voice from the terminal; that's controlled by your app or device settings.

05Results and Tests from the Episode

Julian tests Codex voice in several ways. First, he builds a simple website just by talking. It works, and he can ask for design feedback.

Then he tries to make Codex see his screen. He asks, 'Can you actually see my screen right now?' Codex says it's checking. Julian notes it's 'pretty slow when it comes to seeing the screen' and doesn't recommend it for that use, but it's fine for coding projects.

He also builds a voice agent that can control his whole computer. He types '/voice stop' to stop the voice and runs a command that builds a voice agent app in about five minutes.

Testing that agent, he asks it to open Google. It responds, 'Sure thing. Opening Google now,' and it works.

That shows the voice agent has access to computer use, meaning it can open things, run things, and do work.

06Tips, Limits, and Mistakes to Avoid

Based on the episode, here are some practical tips and warnings:

  • Keep Codex updated – Always update Codex to get the latest voice features.
  • Use '/voice stop' to end sessions – This stops the voice recording cleanly.
  • Don't rely on screen viewing – Julian found it slow and not great for real-time screen sharing.
  • Simple tasks are faster – Codex voice answers simple questions quickly, but bigger jobs take longer.
  • Be patient with big builds – Building an app like a voice agent takes several minutes, so don't expect instant results.

A common mistake is trying to change the voice from the terminal – you can't. That's controlled by device settings.

Also, you don't need to plug in an API, which saves time, but make sure you're on the right plan (Plus or Pro).

07Who Codex Voice Is For and Why It Matters

Codex voice is for anyone who codes or wants to build tools without typing. It's especially useful for people who prefer speaking over typing or who want to speed up their workflow.

Julian says it's easier than building an agent inside Hermes (like Hermes Apollo). For most people, Codex voice is simpler to set up and faster to use.

This matters because it lowers the barrier to coding. You can turn an idea into a working app by just talking. You can even create your own voice assistant, like JARVIS, to control your computer.

Julian points out that the voice agent he built is fully connected to Codex, so it has access to everything Codex can do. That makes it a powerful tool for automation.