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Tom’s Guide
Tom’s Guide
Technology
Amanda Caswell

I just tested Gemini 3 vs ChatGPT-5.1 — and one AI crushed the competition

ChatGPT vs. Gemini logos.

The AI wars just heated up with two major launches this month: Google's Gemini 3 arrived today with promises of "state-of-the-art reasoning" and the ability to "bring any idea to life," while OpenAI's ChatGPT-5.1 dropped less than a week ago touting a "warmer, more conversational" experience with enhanced instruction-following.

Gemini 3 Pro boasts a groundbreaking score of 1501 on LMArena and claims PhD-level reasoning capabilities, while GPT-5.1 introduces adaptive thinking that dynamically adjusts processing time based on question complexity.

Both companies are positioning their latest models as significant leaps forward in AI capabilities, but which one actually delivers? I put both through a rigorous 9-round gauntlet testing everything from image analysis and coding to creative writing and real-time reasoning to find out which frontier model truly deserves your attention and toughest prompts.

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