Head over to chat.com and you'll notice you're redirected to chatgpt.com, where you can talk with one of OpenAI's LLM chatbots. The Verge pointed this out after noticing OpenAI CEO Sam Altman Tweeted (or rather, "X'd"?) just the chat.com URL, presumably because the redirect had just gone live.
The previous owner of the URL was HubSpot founder Dharmesh Shah who purchased it in 2023 for $15.5 million. According to a Wikipedia list of the most expensive domains, it's the third most expensive URL on the internet...