More than a hundred Jupiter Masses, 88 to 98 Jupiter masses. I guess either way we're talking about more than what is predicted for the mass, based on temperature and luminosity.
Still I wonder to what degree this system being only about 50 million years old has to do with all this, or for that matter whether the "Brown Dwarf" being this heavy puts it in a special category of pre-main-sequence low mass red dwarf that might have that lower surface temperature.
So far, we haven't gotten enough photons from it to determine a Lithium abundance, or any other such test. It will be interesting to follow this story, and see what the masses of the next Brown Dwarfs look like.
Forming opinions as we speak