Google DeepMind's Gemini 4 Carbon rebuilt Demis Hassabis' Theme Park from its

Google DeepMind CEO Demis Hassabis has shown the company's new Gemini 4 Carbon AI model reverse engineering the original Theme Park, the management game he programmed in the 1990s, and porting it to the web.

Hassabis shared the demo on X (formerly Twitter) as Carbon rolled out to the public. "Carbon reverse engineers my original Theme Park binaries, adds a new DeepMind themed ride, and ports it to the web in one shot," he wrote, calling it "kind of mindblowing". The post quoted one of his own from a year ago, when he said he had used Gemini 3 to recreate a testbed of Theme Park in a matter of hours, "down to letting players adjust the amount of salt on the chips".

Google also used games to show off the model. Its official account shared Pelican Quest, an open-world 3D browser game set on Google's Mountain View campus in which the player rides a bike as a pelican. According to Google, it was built with Carbon and /swarm, a new feature in its Google Antigravity development platform.

What Gemini 4 Carbon is

Google describes Carbon as its strongest model for long, complex tasks in software engineering, cybersecurity, knowledge work and science. According to the announcement by Koray Kavukcuoglu, Chief AI Architect at Google, it ranks first on the CursorBench 4.0, WANDR and AutomationBench tests at more than twice lower cost per task than the next best outside model. The /swarm preview turns a single prompt into a team of AI agents that can be tracked in real time.

Carbon was first announced on October 28th and given to a group of cybersecurity defenders two weeks ago. It is now available through the API in Google AI Studio for paying developers and enterprises at an introductory price of $2 per million input tokens and $10 per million output tokens, rising to $4 and $20 after November 30th. Google AI Ultra subscribers can also use it in the Gemini app, Antigravity and AI Mode in Search.

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John Popko

I write. I rap. I run. That’s pretty much it.

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