Alphabet stock is soaring, and it could go even higher in 2026.Alphabet (GOOG +1.16%)(GOOGL +1.09%) has made an impressive turnaround this year. In April, its share price sank as low as $141. It's currently sitting above$300 and is up nearly 69% year to date (as of Dec. 5).There's understandable trepidation about investing in stocks after this rate of growth. But the parent company of Google remains an excellent investment, and there's one reason in particular it could continue to do well. Alphabet's AI st ...