Well, it seems to struggle with really complicated equations without a bit of help, but it appears to have no trouble with complicated boundary conditions for simple equations. E.g., it solves most variants of the convection-diffusion equation on its own, given different boundary conditions, multiple regions, etc. While I haven’t managed to get it to actually write down the boundary conditions from an abstract description, that doesn’t really take much time to do oneself.
Also, I got it to successfully solve some statistics on differential equations using plain prompts, like “if the derivative of the average of this distribution with respect to time is equal to …”. Seems to work fine as long as it understands all concepts presented.