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An opinionated guide to which AI to use to do stuff

Simon Willison · Jul 27, 2026 · Industry Trends

AI practitioner guides have shifted focus from chat interfaces to agentic systems doing hours of real work

“The most powerful way to use AI is to give it access to your computer. You do that by downloading the ChatGPT or Claude apps and picking a mode to use.”

Ethan Mollick's evolving AI usage guide now centers on agentic systems rather than chat, reflecting a broader practitioner shift toward AI that can execute multi-hour tasks autonomously. Notably, Gemini has dropped off the recommended list due to lacking a strong entry in the agentic/coding category. The piece also surfaces real UX confusion around the overlapping and mismatched naming of agent modes across Claude and ChatGPT.

agentic-ai claude chatgpt gemini computer-use ethan-mollick

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