Google is rolling out an upgraded version of its generative AI platform Bard, which promises to be its “most capable” model yet as the group steps up its competition with ChatGPT owner OpenAI. The tech giant is launching its new AI foundation model, Gemini, in Bard and other products across the US and more than 170 countries worldwide. Google and Alphabet chief executive Sundar Pichai said it will be the biggest upgrade to Bard since it launched. “We’re taking the next step on our journey with Gemini, our most capable and general model yet, with state-of-the-art performance across many leading…