What is Grok?

Updated November 2, 2026: the company. Announcements and documentation from Grok’s maker are now signed SpaceXSI; the API keeps the name “xAI API” (docs.x.ai, api.x.ai). For consumers, The X Subscription (October 12, 2026) bundles Grok, Grok Bot, Cursor, and X Premium, and the recommended model is Grok 4.7 (see the Grok in 2026 course).

An AI assistant unlike the others

Grok is the AI assistant built by xAI, the company Elon Musk founded in 2023. It arrived in a market already occupied by ChatGPT (OpenAI), Claude (Anthropic), Gemini (Google), and Mistral AI, and it doesn’t try to blend in. From the start, it has relied on a resource no competitor has: a direct connection to X, formerly Twitter.

You can see the difference in very ordinary situations. Say you launch a product on a Tuesday morning and want to know, by Wednesday, how it’s being received. Most assistants work from a knowledge base frozen at a training date, supplemented at best by a web search that surfaces news articles someone has already written. Grok reads posts on X as they’re being written, and reports back the reactions, the recurring criticisms, and the accounts spreading the news. That’s what makes it unique: it captures the conversation while it’s happening, not once others have summarized it.

The vision behind Grok

xAI has given itself a deliberately broad mission: to understand the true nature of the universe. Behind that philosophical phrasing lies a clear technical program: building models capable of advanced reasoning, multimodal understanding, and natural interaction with users.

That ambition translates into four capabilities you’ll use throughout this course. First, deep reasoning: the grok-4.20 models break a problem down step by step instead of producing an instant answer, which makes all the difference when you give it a profitability calculation with several assumptions. Second, multimodal understanding, which lets it handle text and images in the same exchange: you take a photo of a dashboard, ask your question about it, and it answers without you transcribing anything. Third, access to real-time information, through web search and X search, which bridges the gap between the model’s training date and the day you’re working. Finally, creative image and video generation, powered by the grok-imagine family, so you don’t have to leave the tool to illustrate an idea.

How it stacks up against the competition

So Grok doesn’t present itself as a ChatGPT clone, and its positioning rests on four complementary pillars. Access to X data is the most visible: no other assistant can query those posts in real time, which makes it a valuable ally for following the news and trends. Pricing transparency comes next: xAI publishes a clear price list for its API, with automatic caching that lowers your bill when you send the same context several times. The integrated ecosystem is the third pillar: text, images, video, voice, and web search are all available from a single platform, without juggling providers. The advanced reasoning of the grok-4.20 models rounds things out, letting you tackle problems that can’t be solved in one pass.

A tool for every profile

There are several ways into the same engine, depending on who you are. A curious individual will open grok.com, the free web interface, and start chatting without installing anything. A professional on the go will use the iOS and Android apps, which offer the same features from a phone. A developer will go through the xAI API to build Grok into their own applications. An organization that wants to manage usage and billing will turn to Grok for Business. You can start with the first door today and try the others later: your account stays the same; only the way you access it changes.

Key takeaways

• Grok is the AI assistant from xAI, founded by Elon Musk in 2023
• Its main advantage is real-time access to X (Twitter) data
• It offers a complete ecosystem: text, images, video, voice, and search
• It’s available for free at grok.com, or through the API for developers
• The grok-4.20 models offer advanced reasoning with a context window of one million tokens