Is Titanfall open beta for PC?

If so, how do i get in?

open Origin client. Go to My Games. It should be in there to download. If I remember correctly, it was around 12.5 GB

Did you sign up for the beta? If you did, then it should be in your Origin account, no code needed. If you didn't, then you can try Update 3 here: http://www.escapistmagazine.com/news/view/132267-Titanfall-is-Going-Full-Open-Beta-Update-3 . Hope you can get in!