Roblox’s Cube Model: Creating Interactive 4D Worlds | VP of AI Explains

How does Roblox use AI to power a 3D platform for hundreds of millions of users? VP of AI, Anupam Singh dives into their new Cube AI model, integrations with LLMs for complex 3D/4D world-building, and the future of vibe coding and in-experience creation on Roblox.

Watch this episode on YouTube, X/Twitter, or Spotify.

Topics Covered:

* Roblox is the "YouTube of 3D"

* The Roblox Vision: 3D Creation & Consumption at Scale

* The AI Backbone: Safety, Moderation & Infrastructure at Roblox

* Cube AI: Towards a Foundational Model for 3D

* Using Cube AI with 3P Large Language Models (LLMs)

* The Journey to 4D: Crafting Truly Interactive Worlds

* The Rise of "Vibe Coding" at Roblox Scale

* Empowering Players: In-Experience 3D Creation

* AI's Impact on the Creator Economy

* Powering Discovery: Roblox's AI Recommendation Engine

* The Evolving Landscape: The Future of UGC and AAA 3D Content

* Anupam's Advice for Aspiring Creators & Developers

Links to Roblox Releases:

* Roblox Cube AI: https://corp.roblox.com/newsroom/2025/03/introducing-roblox-cube Cube AI

* Cube GitHub Repo: https://github.com/Roblox/cube

* Voice Classifier: https://github.com/Roblox/voice-safety-classifier

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Interview Transcript:

Bilawal Sidhu: Ever wonder how the metaverse gets built? Not just the idea, but the worlds and experiences millions dive into daily.

I'm not talking hypotheticals. Roblox is a colossal platform. In late 2024 alone, 85 million people jumped into Roblox daily, spending an average of two and a half hours in user-generated worlds. Roblox isn't just a game, I call it the YouTube of 3D experiences. And the opportunity is massive.

Last year, creators earned nearly a billion dollars on Roblox. But here's the catch: making 3D content is still really hard. Imagine what'll happen when you slash those barriers to entry, just like we've seen in video creation. The phone in your pocket is practically a visual effects studio.

Today I got something special for y'all. We're sitting down with Anupam Singh, VP of Engineering at Roblox, the man leading the charge on AI and ML at this amazing company that is building the literal instantiation of the metaverse.

Roblox recently announced their Q model, as well as their plans for building a 3D foundational model for this specific purpose of creating interactive 3D worlds. So stick around to hear why they went down this autoregressive approach to tokenize 3D, allowing them not just to predict words, but predict shapes. And how they're building towards this future where one AI model can understand geometry, textures, full body rigging, interactivity, enabling true 4D creation.

We'll also dive into how they're using their own 3D models with the reasoning power of any large language model to build richer, more complex worlds faster than ever before, allowing you to literally speak 3D worlds into existence. And lastly, scale. This isn't just a toy project. This is Roblox building something for their hundreds of millions of users. So if you want to understand the future of 3D and 4D creation, you're not going to want to miss this conversation. Let's get into it.

Anupam Singh: Team is very excited that I'm talking to you. They almost wanted to re-brief me on our technical work, thinking that you're talking to Bilawal, you need to be briefed. I'm like, I've been there since day one when we started this effort.

Bilawal Sidhu: (Laughs)

Anupam Singh: My name is Anupam Singh. I'm VP Engineering here at Roblox with responsibility for infrastructure, the AI platform, discovery, ads engineering, and many other things. Been here at Roblox for three and a half years. Uh, two-time entrepreneur before that. Uh, to summarize my career, uh, it's been about reading some great paper, uh, uh, which is super geeky at at its time, like MapReduce or Transformer, and then spending 10 years trying to make it production-worthy and getting it to billions of dollars in revenue and billions of users.

Bilawal Sidhu: Yeah, don't tell the researchers that. They think it's the zero-to-one innovation, but how do you get that thing o