According to Googler John Mueller, said this morning in a Google Hangout that AMP is not a ranking signal in the Google search ranking algorithm. This can be found at the 15:50 mark into the video.
It was reported back in December that AMP might become a ranking signal, but as of yet, it hasn’t happened.
John said, “Is AMP a ranking signal? At the moment, it is not a ranking signal.”
Although you can use AMP to be more mobile-friendly, just don’t look at it as a ranking signal, at least not yet.
AMP first launched early on Tuesday and will show up only in the mobile search top news box. There’s a chance that Google could expand AMP beyond the news box, and if/when it does, it could then possibly become a ranking signal.