Google has replaced the head of Gemini as its AI chatbot continues to fall behind ChatGPT.Sissie Hsiao has stepped down and been replaced by Josh Woodward, who oversaw the launch of NotebookLM.Demis Hassabis mentioned that the change in leadership aims to enhance the Gemini app's evolution.Despite Google's AI research pioneering efforts, Gemini lags behind competitors like ChatGPT and Microsoft Copilot.OpenAI's ChatGPT holds a 74% market share among AI chatbots in the U.S., with Gemini standing at 13.5%.Google faces a challenge as AI chatbots like ChatGPT pose a threat to traditional search engines like Google.Google aimed to build a ChatGPT rival within 100 days but faced challenges amid competitors' advancements.Google's Gemini 2.5, built upon LaMDA, aims to integrate text, images, and audio for better reasoning and consumer products.Google's decision to make Gemini multimodal from the ground up could lead to advancements in AI applications.Google's custom AI chips might help reduce AI inferencing costs, potentially boosting wider enterprise AI adoption.