Alphabet shares jumped 4 per cent on Thursday, rising for a second straight day, as investors cheered the Google parent's artificial intelligence updates including the rolling out of "AI Mode" to all its U.S. users. A $249.99-a-month subscription for its AI power users, teased at its annual developer conference, also allayed concerns over funding the huge costs of the company's AI development. After the conference, "we are incrementally confident that Google can deliver continued search growth