San Francisco: China has overtaken the US to win the top spot on a list of the world's fastest supercomputers, but the results may say more about Beijing's desire to show self-sufficiency in computing systems than its standing in the global AI race, experts said.The LineShine system at the National Supercomputing Centre in Shenzhen, China, uses domestically designed chips and won the top spot on the TOP500, a biannual global ranking of supercomputers, with the country's first listing in three years.The ranking comes as the US and China are increasingly competing in advanced computing, with US President Donald Trump on Monday signing an executive order that aims to put the US ahead of China in the emerging field of quantum computing.In the June 2026 edition of TOP500, LineShine beat out the previous titleholder, El Capitan, a supercomputer housed at Lawrence Livermore National Laboratory that the US government uses to develop and maintain its nuclear weapons stockpile.But technology and policy experts said the results do not mean that China has the world's fastest computer for AI work because of changes in the computing industry in recent years and the methods used to compile the list. LineShine ranked fourth on a benchmark test designed to simulate computing work that is more similar to AI.BENCHMARK TESTSFor decades, supercomputers strung together many separate machines to work on complex scientific problems such as simulating how atoms interact with one another and were mostly the domain of national labs and universities. To be ranked on the TOP500 list, supercomputer operators must run a set of benchmark tests that aims to mimic such work. But in more recent years, cloud computing companies such as Microsoft, Amazon. com and Alphabet's Google built out massive supercomputers of their own but geared them for AI work instead. Most of those companies do not opt to compete for a spot on the TOP500 list. A study last year by AI policy researchers Konstantin Pilz, James Sanders, Robi Rahman and Lennart Heim found that SpaceX-owned xAI's Colossus system was already likely more powerful than the U.S. government's El Capitan.