Gemini, because on Android it can be the phone's own assistant: make the Google app your default assist app, then long-press the power button or say 'Hey Google' and Gemini answers in place of Google Assistant, working with your screen, calendar and other apps. It is free, and Google AI Plus is Rs 399 a month in India. Add ChatGPT if you want the strongest all-round chat, image making and voice; like Gemini it has over a billion downloads on Google Play. Claude (50M+ downloads) is the better writer, Perplexity (100M+) answers with sources, and Meta AI is already inside WhatsApp. Install only from Google Play and check the developer name (Google LLC, OpenAI, Anthropic, Perplexity AI, Meta) before you sign in. The rule: Gemini as the assistant, plus one chat app you actually like using.
Google's steps to make Gemini your Android assistant (Google app as default assist app, then power button or 'Hey Google'), and what changes from Google Assistant.
The same page as shown in India, in rupees: free plan on a Flash-Lite model with Deep Research, Gemini Live and Gemini Notebook; AI Plus Rs 399 a month; AI Pro Rs 1,950 with Gemini 4 Argon and Gemini in Gmail and Docs; Ultra from Rs 6,500.