Durant agreed to a two-year, $54 million deal with a player option in the second year, sources told The Vertical.
"Kevin made an indelible mark on the Thunder organization and the state of Oklahoma as a founding father of the franchise," Thunder executive vice president and general manager Sam Presti said in a statement. "We can't adequately articulate what he meant to the foundation of this franchise and our success. While clearly disappointing that he has chosen to move on, the core values he helped us establish only lead us to thanking him for the many tangible and intangible ways that he helped our program."
Golden State, Boston, Miami, San Antonio and the Los Angeles Clippers met with Durant and his inner circle on Friday, Saturday and Sunday in the Hamptons on Long Island in New York.
Durant made his announcement on the Players Tribune – for which he is deputy publisher – in a short story headlined, "My next chapter."
The primary mandate I had for myself in making this decision was to have it based on the potential for my growth as a player — as that has always steered me in the right direction. But I am also at a point in my life where it is of equal importance to find an opportunity that encourages my evolution as a man: moving out of my comfort zone to a new city and community which offers the greatest potential for my contribution and personal growth. With this in mind, I have decided that I am going to join the Golden State Warriors.
I’m from Washington, D.C. originally, but Oklahoma City truly raised me. It taught me so much about family as well as what it means to be a man. There are no words to express what the organization and the community mean to me, and what they will represent in my life and in my heart forever. The memories and friendships are something that go far beyond the game. Those invaluable relationships are what made this deliberation so challenging.
It really pains me to know that I will disappoint so many people with this choice, but I believe I am doing what I feel is the right thing at this point in my life and my playing career.
Durant was considered the top free agent on the market and now joins a team that is coming off back-to-back NBA Finals, a championship in 2015 and a 73-win regular season.
The Warriors came back from a 3-1 deficit to defeat the Thunder in seven games in the Western Conference finals, then fell to the Cleveland Cavaliers in the NBA Finals after leading 3-1.
Process w/ Durant and Golden State players has been ongoing for months. They sold him on winning multiple titles together, easing Curry load— Adrian Wojnarowski (@WojVerticalNBA) July 4, 2016
Kevin Durant called Thunder GM Sam Presti and told him directly of his decision to join the Warriors, league sources tell @TheVertical.— Adrian Wojnarowski (@WojVerticalNBA) July 4, 2016
There's been tremendous pressure within Durant's inner-circle to make dramatic move, to ride endorsement wave of change. Well, he did it.— Adrian Wojnarowski (@WojVerticalNBA) July 4, 2016
Draymond's been relentless recruiting Durant this season. Made him feel needed. After 3-1 comeback vs OKC, Green went right back at him.— Adrian Wojnarowski (@WojVerticalNBA) July 4, 2016
In meeting, Bob Myers told Durant: Without you, we can another title or two. Without us, you might win too. Together? We'll win a bunch.— Adrian Wojnarowski (@WojVerticalNBA) July 4, 2016
Durant, the No. 2 overall pick in the 2007 draft, averaged 28.2 points, 8.2 rebounds and five assists this past season. He led the Thunder to the NBA Finals in 2012 and was the league's MVP in 2014.