Of all the AI buzzwords out there, the word “model” would seem free of hyperbole compared to “superintelligent” or the “singularity.” Yet this innocuous-seeming word can mean two contradictory things, and AI companies are deliberately muddling the line between them. A recent Harvard/MIT study of simulating planetary orbits illustrates the contrast between what scientists consider a “world model” and what AI enthusiasts think transformers are generating.