What Search Engine Does Perplexity Use? The Real Answer (and the Bot That Ignores robots.txt)
Perplexity says it built its own search engine. A federal lawsuit says it also borrowed Google’s. Here’s what’s confirmed, what’s contested in court, and the Perplexity bot that, by Perplexity’s own documentation, generally ignores your robots.txt.
What Search Engine Does ChatGPT Use? Confirmed vs. Assumed.
OpenAI never names its search engine on a vendor list, but the paper trail leads straight to Bing. Here's what's confirmed, what's still assumed, and the two gates your site has to pass before ChatGPT will quote it.
What Search Engine Does Claude Use? The Confirmed Answer (Plus What Most Guides Miss)
Anthropic's Trust Center quietly lists two "Web Search" subprocessors for Claude: Brave, and a lesser-known vector database called turbopuffer. One crawls the web. The other doesn't — so what is it actually doing, and does labeling it "search" even make sense?