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The ability of o3 to agentically use tools in sequence in its chain-of-thought in the chat interface remains a huge differentiator among AIs. I am not sure o3 is "smarter" than Gemini 2.5 or Claude 4 (both do better websites than o3, for example), but you can see how tool use makes a difference because o3 can mix searches, code use, image generation, and revise plans better:
"Come up with 20 clever ideas for marketing slogans for a new mail-order cheese shop. Develop criteria and select the best one. Then build a financial and marketing plan for the shop, revising as needed and analyzing competition. Then generate an appropriate logo using image generator and build a website for the shop as a mockup, making sure to carry 5-10 cheeses that fit the marketing plan."
