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- 🤖 Build Your Own Jarvis AI Assistant That Controls Your Computer in Just 3 Prompts (No Code Needed)
🤖 Build Your Own Jarvis AI Assistant That Controls Your Computer in Just 3 Prompts (No Code Needed)
How to build a working Jarvis-style desktop assistant that talks, controls your screen, and generates thumbnails by voice with Codex + GPT Realtime-2.
Robin Do
July 10, 2026
TL;DR
You can build a Jarvis AI assistant with Codex, GPT Realtime-2, and a few clear prompts. It can talk in real time, use tools, control parts of your desktop, and generate visual outputs without requiring coding experience.
The workflow starts with a clean local Codex project, an OpenAI API key, and one strong prompt that tells Codex to build the desktop app. After that, you test the first version, fix tool errors, improve the design, and make the assistant easier to use.
The most useful part is computer use mode and the voice-controlled thumbnail generator. Once the assistant can type, submit prompts, search the web, generate images, and edit by voice, it becomes a real working system.
Key points
One important fact: The first working version can be built in about 3 prompts.
One common mistake to avoid: Don’t skip API key setup, especially for web search.
One practical takeaway: Build the basic assistant first, then improve it step by step.
Table of Contents
What Sounds Most Impressive To You? |
Introduction
I built a Jarvis AI assistant named AIFirer that can hear my voice, answer in real time, open menus, change its mood, switch the background color, enter computer use mode, open my browser, and launch Codex.
And I built the first working version with just 3 prompts. Here’s what this Jarvis AI assistant can do by the end:
Feature | What it does |
|---|---|
Real-time voice chat | Talk naturally with interruption support |
Animated face | Blink, react, change mood, and move its mouth while speaking |
Computer use mode | Control parts of your desktop from voice commands |
Tool use | Search the web, generate images, and create Mermaid diagrams |
Artifact panel | Show visual results, notes, charts, and structured output |
In this guide, I’ll walk you through the full build step by step, from setting up Codex to turning a simple desktop companion into a useful voice agent you can actually control.
I. Setting Up Codex and Building the First Version
Before building anything fancy, you need a clean setup.
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