Alphabet and Apple have entered a multi-year agreement to integrate Google's Gemini AI models into Apple's next-generation AI features, including an upgraded Siri set to launch this year. This collaboration has driven Alphabet's market capitalization close to $4 trillion, joining Apple, Microsoft, and Nvidia as the only companies to reach this milestone. Analysts view the deal positively, anticipating it will strengthen both companies' AI strategies and stock performance in the coming years.