Grok is xAI's conversational AI assistant and answer engine, available on grok.com, iOS, Android, and inside X, that searches the web and X live and returns cited answers grounded in real-time sources. It runs on a freemium model with a genuine free tier, and paid SuperGrok tiers start at $30 per month for higher limits and access to frontier models.
Who builds it
Grok is built by xAI Corp. The same company also exposes Grok's models through a developer API, so the assistant used inside grok.com, the mobile apps, and X shares its underlying models with what developers can build against directly.
What it does
Grok answers questions by searching the web and X live, so its answers reflect what's happening right now rather than only what was in its training data, and it returns live citations from primary sources across the web with inline links back to them. The flagship API model is Grok 4.5, with a 500,000-token context window, and xAI describes the underlying consumer model as its own frontier model, Grok 4. Independent benchmarking from Artificial Analysis measured Grok 4.5's output speed at 93.2 tokens per second. Grok also supports dozens of languages — xAI states support for 30+ languages — for both reading and writing.
Core features
- Freemium access with a genuine free tier and paid SuperGrok tiers from $30/month for higher limits and frontier-model access
- Real-time web and X search, with answers grounded in live sources rather than training data alone
- Inline live citations linking directly back to primary sources
- Grok 4.5 flagship model with a 500,000-token context window
- Full API access — text, vision, voice, image, and video through one key
- API pricing on Grok 4.5: $2 per 1M input tokens, $0.50 per 1M cached-input tokens, $6 per 1M output tokens
- Support for 30+ languages
Who it's for
Grok suits people who want an assistant that leans on live web and X search for current-events questions and cited, up-to-the-moment answers, as well as X users who want the assistant available directly inside the platform. The free tier covers Grok's chat and voice features within generous limits; SuperGrok at $30/month raises those limits and unlocks frontier models and multi-agent reasoning for heavier use. Developers building on Grok's models — including its real-time search and multimodal capabilities — use the same API that powers the consumer product.
Data and compliance
xAI states that it may use content and interactions with Grok — prompts, searches, and other submitted materials, along with Grok's responses — to train its models by default, but that this is an opt-out setting: once you turn training off, new conversations stop being used for training, and Private Chat keeps content out of training entirely regardless of the setting. We don't track a specific statement in our data on region-locked (EU-only) hosting for Grok, so organizations with strict data-residency requirements should confirm current details directly with xAI before relying on Grok for sensitive data.