I tested ChatGPT's Deep Research against Gemini, Perplexity, and Grok AI to see which is best - Lance Whitney, ZDnet

More AI chatbots now offer a deep research option, through which they can investigate a topic for you. Acting as autonomous AI agents, the bots will surf the web on your behalf, find the right online sources, and then present you with a detailed report based on their findings. The goal is to save you the time of checking out dozens or hundreds of websites yourself. Deep Research is quickly becoming a powerful feature among a host of AIs. You'll find it with OpenAI's ChatGPT, Google Gemini, Perplexity AI, and even xAI's Grok (which calls it DeepSearch). Microsoft introduced a type of deep research with two AI agents, Researcher and Analyst; however, they require a Microsoft 365 Copilot license with an Enterprise or Business subscription, so they're not yet available to the average Copilot user.

https://www.zdnet.com/article/i-tested-chatgpts-deep-research-against-gemini-perplexity-and-grok-ai-to-see-which-is-best/