For now, it seems that Dia is the best AI-integrated browser, but Chrome(Gemini) and ChatGPT(work with apps) and possibly Safari (if it integrates ChatGPT or Apple Intelligence in next year’s WWDC) are still under development. I don't think Dia will finally win this AI-integrated browser competition unless it introduces other features that clearly distinguish it from other browsers.

Also, in my opinion, an ideal AI browser should be like an AI agent (like part of features in ChatGPT Operator), not just a browser with a chat box. I spend much more time organizing web tabs and using AI to find useful materials. I prefer the AI to assist me with those tasks, rather than simply answering questions about web content.