Grok is xAI’s family of AI assistant models. xAI, the company founded by Elon Musk in 2023, develops Grok and offers it through its own apps and API and via integration with the X platform.
As of June 2026, the xAI site references the Grok 4 generation, with grok-4.3 appearing as the current model on the homepage. Earlier Grok generations preceded it. Specific model names and versions change quickly, so the figures here reflect what the xAI page showed on the verification date rather than a fixed roadmap.
Distribution is primarily through xAI’s commercial apps and API plus the X platform.
Why business readers should care: Grok is a fast-moving frontier model line backed by significant compute investment and tied to a major social platform, making it a competitor worth tracking even where it is not yet an enterprise default.