Interestingly, per the recent Google antitrust ruling documents, AI mode is extra fast because of a special FastSearch index: https://x.com/Marie_Haynes/status/1963031598829314161
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It also seems to excel at things ChatGPT 5 Thinking isn't good at. Simple things like "Here's a screenshot of text, please transcribe it" - ChatGPT 5 Thinking will spend 2 minutes and still get the results wrong, while Gemini Pro will spend 20-30 seconds and transcribe everything perfectly.
Obviously that's just 1 use case, but as someone who previously used ChatGPT exclusively, I'm increasingly impressed by Gemini the more I use it. Mainly due to the much faster thinking times that seem to provide equal or better results than GTP 5 Thinking.