Inter has made it official on their website that Cassano leaves the club. Inter.it writes:
F.C. Internazionale communicate that Antonio Cassano is now a Parma player after 39 matches and 10 goals for the Nerazzurri last season. The President Massimo Moratti and Inter are greatful to Antonio Cassano for wearing Inters shirt and honoring it with his class. He will always be admired by Inters supporters. “It has been an honor having had him with us and a great luck to see him wear our colors”, says Massimo Moratti.
Source: Inter.it