A Functional Taxonomy of World Models - Dr. Fei-Fei Li
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Renderers, Simulators, Planners, and the Loop That Connects Them
A Functional Taxonomy of World Models Renderers, Simulators, Planners, and the Loop That Connects Them Fei-Fei Li Jun 03, 2026 985 85 188 Share “The world is everything that is the case.” — Ludwig Wittgenstein, Tractatus Logico-Philosophicus , 1921 The world is not made of words. In an earlier essay , we argued that spatial intelligence is AI’s next frontier and that world models are the path to it. Here, the World Labs team and I want to go one level deeper: of the many things now being built and called ‘world models,’ which functional pieces actually compose that capacity — and what is each
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