The clip, released Monday, features the actresses having a conversation while sitting together at a resturant.
"Why do you need to do this?" Blanchett asks as a smiling Bullock who replies, "Because it's what I'm good at."
The teaser also features quick glimpses of Bullock and her team attempting to pull off a heist at the Met Gala in New York City.
Ocean's 8 directed by Gary Ross, is set to arrive in theaters on June 8.