Phi-Zero: thinking about physics before the first frame
Instead of generating the next frame directly, the model first reasons about how things should move.
Phi-Zero is a video world model built on what the authors call physical language. The idea is to reverse the order of two steps that usually happen together.
Instead of generating the next frames right away, the model first reasons about how everything should move and change physically. Only then does that reasoning go through the video generator, which renders the frames.
Why this matters
- The separation greatly improves prediction of what happens next.
+ 2 points on paid plans.
Spec sheet
- Status
- Code "coming soon"
- Approach
- Physical language before rendering
- Applications
- Interactive worlds, autonomous driving, robots
- Highlight
- Above-average physical coherence
The microcourse
1.Why separate reasoning from rendering
2 minA typical video generator predicts pixels from pixels. It learns that certain images tend to follow others, without ever representing why — and that's why it slips up on physics: objects going through walls, liquid flowing upward, shadows that don't track.
Phi-Zero inserts a step before: describing what should physically happen. Rendering becomes a translation of a decision already made, not a guess. It's the same principle that makes a reasoning model get more math answers right than one that responds directly.
- The three applications2 min
- Current state1 min
Faltam 2 classes para você concluir
You're looking at the tool's profile — what it is and what it doesn't do. The step-by-step, selection criteria, and what to do with it are in the microcourse, and the full microcourse is from Expert.
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How we verified
We track releases straight from primary sources, transcribe what's demonstrated, verify every name and number against the manufacturer's official documentation, and rewrite it in Portuguese — along with the tool's limitations, which is the part the announcement leaves out.
The official address of Phi-Zero opens on the Expert plan