Can AI agents write complex software like a web browser?

Yes, AI agents have demonstrated the ability to write over one million lines of code to build a functional web browser from scratch.

What technology was used to build the AI browser?

The browser was built using GPT-5.2 within the Cursor AI platform, with its rendering engine developed in Rust.

How functional is the AI-generated web browser?

The AI-generated browser can render simple websites quickly and mostly correctly, though it's not yet on par with established browsers like Chrome or Firefox.

Home / Technology / AI Agents Code Browser From Scratch

AI Agents Code Browser From Scratch

20 Jan

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Summary

AI agents successfully generated one million lines of code for a web browser.
The custom browser was built from scratch using GPT-5.2 in Cursor.
The rendering engine was developed in Rust with a custom JavaScript VM.

AI agents have achieved a remarkable feat by writing over one million lines of code to build a web browser from the ground up. Utilizing GPT-5.2 within the Cursor development environment, the AI constructed a functional browser that operated uninterrupted for a week.

The core of this new browser is a rendering engine meticulously crafted from scratch in Rust. This engine successfully handles HTML parsing, CSS cascading, layout calculations, text shaping, and painting. It also incorporates a custom-built JavaScript virtual machine, showcasing a sophisticated level of AI-driven software development.

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