The Nikkei 225 Index surged as much as 1.24% to an unprecedented 44,185.73 before closing 0.4% lower at 43,459.29, snapping a three-day rally. The broader Topix finished the day down 0.5%.

A developer from Australia ran Claude Code in a continuous loop for three months to develop a GenZ compiler. He calls the ...

An illustration of a magnifying glass. An illustration of a magnifying glass.