The world of web browsers have not been spared by the trend of integrating LLM functionality. But there are fundamental issues with it and Vivaldi addresses them.
There are currently more than 5800 AI and LLM out there. In Vivaldi anyone is free to add easily with a click those of their choice in their search engine list, as bookmark, in the web panel, as extension or even as script. That all browsers now include AI as a function is more due to commercial hype than real utility (privacy concerns apart). If I want to use an AI, I prefer to use one that really works for me and adjusts to my needs, instead of already having a built-in ChatGPT or similar by default. In Vivaldi I have this possibility to choose, the main feature of this browser, in the others I have to swallow what they offer, whether it works for me or not.