xAI
Also known as: xAI Corp, Elon Musk AI
xAI was founded by Elon Musk in 2023 after he departed OpenAI's board. The company's stated mission is to understand the universe, and it positions Grok as a more intellectually curious and less filtered AI compared to competitors. Grok is the primary product: an AI assistant and model family accessible via grok.com, the X app, and the xAI API. The current flagship model as of late May 2026 is Grok 4.3, with Grok 4 having introduced native tool use and real-time search integration.
xAI's key infrastructure advantage is Colossus, a data center in Memphis, Tennessee, that the company claims houses around 150,000 GPUs and processes over 300 million queries daily. Grok differs from other frontier assistants in two notable ways: it has deep real-time access to X posts and trending content, and it carries a more opinionated, sometimes irreverent tone by design. The company also ships Grok Build, a coding-focused model available via API.
For builders, xAI matters as an alternative API provider with competitive reasoning models and a distinctive real-time data advantage for social and news-aware applications. SpaceX announced it had acquired xAI, though the exact terms and implications for the developer API were still being clarified as of May 2026.