The AI inside the editor where the file will live: Copilot in Word, Gemini in Google Docs, or ChatGPT or Claude added to Word. Copilot drafts, rewrites and formats in Word with Microsoft 365 Personal, Rs 689 a month in India. Gemini works inside Docs with Google AI Pro (Rs 1,950 a month) or Workspace Business Standard. ChatGPT's Word add-in, free on every ChatGPT plan since September 2026, drafts from notes, revises selected text and adjusts headings and formatting. Claude for Microsoft 365 comes with Claude Pro ($20 a month), and Claude Docs, on every plan including Free, makes a document inside a Claude chat. For a report or one-pager built from a prompt, Gamma lays it out for you, free to start with 400 credits and Plus at $9 a month billed yearly. The rule: write where the document will be edited and shared, so the formatting survives.
OpenAI's dated log of changes: GPT-6 Sol for Plus and GPT-6 Luna for Free and Go (7 October 2026), ChatGPT for Word on every plan (17 September 2026), the India Go launch at Rs 399 including GST and the end of its free year on 21 January 2026.
A Wharton professor's regular guide to the assistants: ChatGPT or Claude for real work, Copilot fine for office documents but behind on agents, and why he does not yet suggest Gemini as anyone's main system.
Microsoft 365 with Copilot in rupees: Personal Rs 689 a month or Rs 6,899 a year, Family Rs 819, Premium Rs 1,999 a month with higher Copilot limits, Pro Rs 9,999; Copilot features go to the subscription owner only.
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.
Workspace in rupees, billed monthly: Business Starter Rs 270 a user a month with Gemini in Gmail and company data kept out of model training, Business Standard Rs 1,080 (Rs 864 introductory) with Gemini in Gmail, Docs and Meet and Gemini Notebook.
Anthropic's plan page, read 10 November 2026: Free with memory, voice, Claude Docs and up to 5 projects; Pro $20 a month ($17 billed yearly) adding Research, Claude Code, Claude in Chrome and Claude for Microsoft 365; Max $100; Ultra $200. Prices exclude tax.
Makes documents, presentations and web pages from a prompt: free with 400 credits at signup, Plus $9 a seat a month ($108 billed yearly) with 1,500 credits a month.