xAI's assistant, built into X, with access to current posts and news as they happen. Limited free use with an X account; higher limits on paid tiers.
From the site: Grok is an AI assistant built by SpaceXAI. Chat, create images, write code, and get real-time answers from the web and X.
Why I recommend it: Useful when you need what is being said right now rather than a considered answer. Its live sources are public posts, so treat them as claims, not facts.