There's been an ever-widening rift between Metal Gear creator Hideo Kojima and Konami all year, and things have gotten so bad that the company actually banned him from attending The Game Awards to accept awards for Metal Gear Solid V. Even while Konami removed Kojima's name from all promotional materials, shut down one of his studios, re-purposed another, and cancelled his other game, they continually denied that he was leaving the company, stating that he is just on vacation.
Kojima reportedly left the company on October 9th, but was still under contract for about two more months. According to Japanese publication Nikkei, that contract officially ended today, and Kojima is already planning to open a new studio. We don't yet have any details about what kind of games he's planning to make or how he'll go about creating his studio, but NIkkei states that he is already in talks with Sony Computer Entertainment. Konami has not yet commented on this story, but we'll update you as any new information becomes available.