There’s so much hype on world models these days. This is somewhat our internal take on the taxonomy. 🌎🚀
#worldmodels
Fei-Fei Li@drfeifei
http://x.com/i/article/2062244283940544512
12:02 PM · Jun 3, 2026 · 4.9K Views
Fei-Fei Li's taxonomy dividing world models into renderers, simulators, and planners helps clarify congested AI terminology
World Labs uses the taxonomy for environmental simulation.
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Yu Su@ysu_nlp
A refreshing take on world models from @drfeifei
Grounding the taxonomy (renderer, simulator, planner) in the classic agent loop is brilliant imo. Also agree on the unified world model vision.
A few important questions still remain quite open:
1. The current discourse on world models is centered around the physical world. How to model the digital world?
We need digital world models as well, but they probably will take quite different forms (e.g., less on rendering, symbolic representation / language takes more prominence)
2. What level of fidelity is needed for simulation?
Most of the time, humans are probably not simulating the world (physical or digital) at a high fidelity. our simulation can be quite coarse-grained, lossy, and opportunistic. and that seems sufficient for most human activities.
3. Do world models need language? Is language only for communication?
Modern human civilization builds on symbolic representations like language. Language is as much a tool for representation as it is a tool for communication. If world models are about representing the world around us, should we abandon the most powerful representational tool humanity has ever created and try to learn from scratch?
Fei-Fei Li@drfeifei
http://x.com/i/article/2062244283940544512
3hViews 4.9KLikes 30Bookmarks 15
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Justine Moore@venturetwins
"World model" might be the most overloaded term in AI right now.
If you're confused about what a world model actually does (many are!), I'd highly recommend this post from @drfeifei.
It breaks down these models into three functions + predicts where they're headed 👇
Fei-Fei Li@drfeifei
http://x.com/i/article/2062244283940544512
5hViews 4KLikes 48Bookmarks 15