It will be the world's most powerful console when it comes out in November and will cost £449. That's £100 more than Sony's PlayStation 4 Pro which was released last year.
Microsoft has announced 22 titles which will be playable on the Xbox One X.
Some experts say £449 is too much for what is basically a more powerful version of the existing Xbox One S.
Newsbeat got the opinions of four key people at E3 in Los Angeles to tell us whether this will be an instant game changer, a slow success or an expensive flop.
"The Xbox One X looks like a bit of a beast but for me, I come to these things and I want to see the games and we saw a lot of really impressive CG trailers but where's the game play in that?
"It's all very slick, it's all very polished but we've got to get some people on it playing. Hopefully that's what we'll get to do this week.
"I think that the console looks great but when you boil it all down, we got a lot of console launch exclusives but we didn't get any real, meaningful first-party titles."
"We have the world's most powerful console and like with any kind of consumer product out there, there's a certain customer that walks in and says, 'I just want the very best.' And we have the very best, the world's most powerful console.
"There are many people that come in and just want an affordable console that plays all of the games that we've shown here, plays them with great HDR support.
"We have the 4K blu-ray drive inside the S console. It's a great line-up of games, respecting the content that you buy from us.
"If you start on the Xbox One S and then later decide that you want to go to the Xbox One X, all of those games are going to play better on your new console and they stay with you."
"That is a hell of a lot of money to fork out, for what would be for some an upgrade, rather than a brand new console experience - especially if you're trying to get new people on to the platform against PlayStation or against PC.
"Once you play a game for that first time, if it's something you haven't played before, that's where you can be sold on something."
"The gaming industry is going to change more in the next five years than it has done in the past 30.
"Not just more powerful hardware so we can get visual fidelity up, but also audio and how the game feels - the physical fidelity.
"Those things are really exciting. Having more power gives us more freedom to be more creative."