Which AI to Use? 2026 Guide

Ethan Mollick updated his 'Which AI to Use' guide on July 23, and it cuts through the noise. In 2026 you have a dozen models that claim to be the best, but the right choice depends on what you actually need. Mollick breaks it down: Claude Opus 5 for long form writing and editing, FLUX 3 for image generation, ChatGPT for general research and brainstorming. The guide also covers agent systems that can complete multi step workflows in one go.

For a small business owner, this is the map you need to stop wasting time testing every new model. You do not have the bandwidth to experiment blindly. Pick one model for your core task and stick with it until you hit a clear limitation. The real value is in the agent systems section. These are not chatbots. They can scrape a website, write a report, format it, and email it to your team without you touching a keyboard.

Your concrete move this week is simple. Read the guide. Then identify one repetitive task in your business, something that takes you 30 minutes daily, and find an agent system that can handle it. Start with a free trial of a tool like AutoGPT or a custom GPT action. The first win will be small, but it proves the concept and frees up time for higher value work.

The honest limit is that agent systems still fail unpredictably. They misinterpret instructions or get stuck in loops. You need to monitor the output until you build trust. Do not turn over a critical customer facing process without a human review step. Use agents for internal workflows first, then expand carefully.