The best human has a GO rating of 3695 while Alpha GO Zero has an ELO rating of 5185. Human players were beaten 100 to 0 and AI GO systems can only crush the prior best AI to show improvement.
The hardware cost for a single AlphaGo Zero system, including custom components, is estimated to be $25 million.
There has been an open-source implementation of Alpha Go Zero. ELF OpenGo is the first open-source Go AI to convincingly demonstrate superhuman performance with a perfect (20:0) record against global top professionals.