Grok is a large language model trained by X.AI that integrates live data from X (formerly Twitter) to answer questions with current context — a meaningful differentiator in a market where most LLMs have knowledge cutoffs. It handles text analysis tasks across languages and connects to X's API, making it useful for monitoring social sentiment or market chatter in real time. The freemium model lets you experiment at no cost, but the free tier is genuinely limited; meaningful API access requires a paid subscription starting around $20/month for the Grok API, or bundled access via X Premium subscriptions. The catch: it remains less widely adopted and benchmarked than OpenAI or Anthropic offerings, so enterprise reliability data is still thin.