I am buying a 2015 GS 350 AWD. Does this come standard with intelligent high beam technology? Is it an option or did it not come with it at all?

 

Not sure you can get that on a 2015. Seems they started offering it on the GS in 2016.

 

jtrue28 is correct. The Intelligent High Beam feature is only available as part of the Lexus Safety System+ offered in 2016 as an option, standard on 2017+.

 

Negative on the auto highbeam in 2015 MY.
IMO, auto highbeam is the most dumbest feature that ever invented. If I want highbeam, I flick it on. And with today's lighting technology, highbeam should rarely be used.
I have this feature on my '17 RX and tried it and ended up blinding people on a curvy road because the radar only see what's in front of it. I can't count how many time people left this feature on and the ended up blinding oncoming traffic.

 

Radar and auto high beams have nothing to do with each other. The auto high beams use a camera mounted near the rear view mirror to watch for other cars and taillights. That said, I find that it works well, but not as well as it did on my last 2015 Infiniti Q50S and nowhere near as well as the one on my 2014 Ford Fusion. The Ford's worked perfectly at all times, even curvy roads. On curvy roads, the system in my 2018 GS could definitely be improved upon. Does not respond nearly as quickly as it should/needs to.

 

I have it on my Highlander but don't really use it. I don't have any complaints with how it works, but I just don't find it to be that useful of a feature. Maybe if we lived somewhere more rural where brights come in handy, but we're usually driving in town/city so I don't really use the brights.

 

My wife's 2010 RX has it...seems to work okay. I never use it on my GS. LEDs are plenty bright enough for me.