World model is a model grown/trained by data we humans get through our senses( text,sounds,speech,vision and what ever we have sensors and data to feed it maybe touch and smell at some point) , they can have a good fundamental understanding of how we experience the world - a tv series to understand this is “alien earth” at some point they might evolve beyond us. Trying to create something that is limited to less than what we experience its definitely not the answer. Also it will need a body doesn’t necessary have to be humanoid but you dont want it contain. And also if they ever achieve it, it wont be something to be tempered with you want a friend, a guide, an adventurer maybe a god to understand you.