Criterion ChatGPT Microsoft Copilot
CategoryAI Chatbots & AssistantsAI Chatbots & Assistants
In one sentenceOpenAI's general-purpose AI assistant for chat, writing, coding, research and file work, built on OpenAI's GPT models.Microsoft's AI assistant, free on its own and built into Word, Excel, PowerPoint and Outlook through Microsoft 365 plans.
Problem it solvesGives people one place to draft text, answer questions, analyse files and get coding help without setting up any technical tools.Brings AI help into the Office apps people already use for documents, spreadsheets, slides and email.
Free planYesYes
Developer APIYes — docsNo
Open sourceNoNo
PlatformsWeb, Desktop app, Mobile appsWeb, Windows, iOS, Android, Microsoft 365 apps
Pricing (summary)Free costs nothing; Go is $8/month and Plus $20/month. Pro comes in $100, $200 and $500 monthly tiers, and Business is $25/user/month monthly or $20/user/month billed annually (2+ users). Enterprise and Edu are priced through sales.
Checked 2026-10-19		The Copilot app is free with limited usage. Microsoft 365 Personal ($9.99/month), Family ($12.99/month) and Premium ($19.99/month) add Copilot in Office apps. Businesses can buy bundles with Copilot or a Copilot Business add-on per user.
Checked 2026-10-19
Strengths
  • Wide range of tiers from free to $500/month
  • Single subscription spans chat and Codex
  • Large, documented model lineup
  • Deep Office integration
  • Bundles storage and Office apps
  • Business add-on priced per user
Limitations
  • Model names and rollout change often
  • Lower tiers may show ads
  • Help-centre pages give slightly inconsistent model naming during rollout
  • Models used per plan are not named on pricing pages
  • Family plan AI features are owner-only
  • No AI features in Microsoft 365 Basic