Solo developer races to build GTA 6 clone with AI agents before Rockstar's November launch

Solo Developer Creates GTA Clone Using AI Agents

Waiting 13 years for a video game can test anyone's patience. Ziwen Xu, a 25-year-old founder of AI agent startup Hyperecho, reached his limit and decided to build his own version of GTA 6 using AI game development techniques1

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. The project, dubbed GT-Caliber, kicked off on June 10, 2026, with a simple post on X: "Day 1 of building GTA 6. Still feels fake typing that out."1

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The initial footage showed exactly what you'd expect from day one—a blue box wandering around an empty 3D plane. But what happened next demonstrates both the speed and chaos of AI agents in game development.

Chaotic Development Across Multiple Game Engines

The solo developer creates GTA clone journey has been anything but smooth. Ziwen Xu switched engines three times within the first week of development1

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. Starting with Godot engine, he spent a week ignoring advice to switch before finally migrating to Unreal Engine 5 on day seven3

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. By day eight, his Mac died because every AI agent opened the game simultaneously to screenshot it3

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. Eventually, he settled on Unity, explaining that getting on a "real engine" was crucial to make a AAA game1

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. When he attempted to upgrade to Unreal Engine 5.8 to leverage its Model Context Protocol, the results weren't great. "The 5.8 MCP isn't like crazy good, and it actually slows the build down," Ziwen Xu admitted3

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Open-Source GTA Clone Built Through Vibe Coding

GT-Caliber runs on daily public updates and an open GitHub repo, with AI agents continuously looping, taking community feature requests, and generating pull requests in real time2

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. There's no publisher and no studio budget—Ziwen Xu relies on whoever shows up for the project1

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. Almost everything was created through what he calls "vibe coding" with a loop of AI agents1

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. The AI-generated game approach handled asset creation, generating Rockstar-style news clips, characters, cars, and buildings. By day three, NPCs were walking around, cars appeared on roads, weapons functioned, and phones with Instagram were implemented1

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. However, the human touch in game development became apparent when things went wrong.

AI Accidentally Builds Los Angeles Instead of Vice City

In one of the more amusing mishaps of this chaotic development, the AI agents started building the wrong city almost immediately. By day two, they had recreated Los Angeles instead of Miami, which serves as the real-world inspiration for Vice City in Rockstar's GTA 63

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. Despite this geographical confusion, by day seven, a whole neighborhood with streets had appeared on screen. Ziwen Xu called it the first time the project looked like an actual GTA game rather than a prototype1

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. While NPCs lost their walking animations during the engine transitions, the AI agents managed to create an in-game phone with maps, contacts, and a wallet3

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Racing Against Rockstar's GTA 6 November Launch

The timing creates an interesting backdrop. Rockstar officially announced that GTA 6 pre-orders open on June 25, 2026, with the game launching November 19 on PlayStation 5 and Xbox Series X/S1

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. This gives Ziwen Xu about five months to complete his challenge2

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. On one side, there's a solo developer with AI agents and no budget. On the other, Rockstar had 13 years, thousands of people, and a reported $3 billion budget for GTA 64

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. According to Hyperecho developers, they're spending significant amounts on AI credits, as creating a game from scratch using AI loop agents is no simple task4

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What This Reveals About AI's Role in Game Development

This project confirms that AI, by itself, is nowhere near capable of developing a game like GTA 63

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. Take-Two CEO Strauss Zelnick believes the lack of creativity would prevent the creation of games on par with the Rockstar Games series, even if it were possible for a huge open-world game to be built autonomously by AI3

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. The graphics revealed in development videos show classic Unreal Engine 5 visuals, but the lack of style and design flatness resembles what you might find in a Roblox game4

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. Community reaction has been fairly positive so far, though most gamers aren't taking it as a serious competitor—viewing it more as an AI enhancement project rather than actual game development4

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. Whether GT-Caliber ships anything resembling a real game or becomes the most entertaining dev diary on the internet, it highlights critical questions about AI's capabilities in creating experiences that match human creativity and design sensibility.