On October 23, 2025, Alphabet Inc. (GOOG) closed at $253.73 (+0.48%), with after-hours trading lifting the price to $255.50 (+0.70%). The stock's rise was driven by two major developments: Anthropic announced a 'tens of billions' dollar expansion of its use of Google Cloud, including up to one million TPUs, significantly boosting Alphabet's AI infrastructure business[2]. Additionally, Alphabet revealed a verified quantum computing breakthrough using its Willow chip, achieving a 13,000x speedup and marking the first scientifically confirmed 'quantum advantage,' further solidifying its leadership in advanced technologies[1]. These announcements, ahead of Alphabet’s Q3 earnings on October 29, have fueled investor optimism and extended the company’s year-long rally.