Imagine a translator who has memorized every line in advance: they respond instantly, no need to listen to the whole conversation again. That's how the new model works: instead of running atoms through a computer for hours, it directly outputs the crystal's free energy at any temperature and pressure.
Free energy is a measure of how stable a material is under given conditions. In the past, you had to run a computer simulation of atomic motion, which took hours. Now, from a single static structure, the model produces the entire free-energy surface as a function of temperature and pressure, along with heat capacity, entropy, and volume.
For training, the researchers used data at three levels of accuracy: from a simple approximation where atoms vibrate like independent springs, to precise simulations and experimental measurements. This allowed the model to predict polymorphic transitions, the moments when a crystal changes its structure, and even correct errors in the underlying method. Now the translator who has learned all the lines is ready to work without a hitch.
The model predicts free energy in 0.1 seconds per structure — a hundred thousand times faster than nonequilibrium molecular dynamics and a thousand times faster than quasiharmonic calculations.