Cots has is as "Stanton may opt out of contract after 2020 season" but, he'd probably be pretty ballsy to do so (he'd be leaving $218 million on the table at age 30)
http://www.baseballprospectus.com/compensation/cots/national-league/miami-marlins/
Assume there's a 100% chance he only opts out if he is absolutely sure a team is going to pay him substantially more than $218 million. Much like A-Rod opting out of the first mega-deal...
