The holiday season is fast approaching, and that means Black Friday sales and lots of Christmas shopping. Timing up with this, the AI chatbots of the world are all launching their own AI shopping features.

This started with ChatGPT's new shopping research tool, which embarks on detailed research projects based on your shopping prompts. For example, finding all of the best TVs under a certain price, offering links, deals and explanations of why they're right for you.

Then, the competition all fell in behind, with Perplexity creating a similar tool, utilising what the chatbot already knows about you to help inform purchasing decisions. Both Gemini and Microsoft's Copilot also had the same idea, launching their own versions, too.

So, how do all these shopping tools work, and which one shou

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