The four big AI assistants compared for everyday business work.

The best free resources

• An opinionated guide to which AI to use to do stuff (Summer 2026)
  A Wharton professor explains which assistant to pick for real work, and when free is enough.
  Ethan Mollick, One Useful Thing · Jul 2026

• Claude vs. ChatGPT: Which is best? [2026]
  Side-by-side test of the two leading assistants, with plan prices.
  Zapier blog [vendor] · updated Oct 2026

• The best AI chatbots in 2026
  Compares 11 assistants incl. Gemini and Copilot on quality, tools and ease of use.
  Zapier blog [vendor] · updated Nov 2025

• Arena leaderboard
  Live rankings of AI models based on votes from real users.
  Arena

• Artificial Analysis
  Independent scores for model quality, speed and cost per task.
  Artificial Analysis

Curated by effectiveAI. Every link checked November 2026. Know a better free resource? Tell us.