Grok is an AI assistant developed by xAI, designed to be a truth-seeking companion that provides accurate, up-to-date answers across a wide range of topics. Available at grok.com, on the X platform, and through iOS and Android apps, Grok combines conversational AI with real-time search and advanced reasoning to deliver answers grounded in current information rather than relying solely on training data.
Models and Capabilities
The Grok model family has evolved through several generations, with the current flagship being Grok 4.3. Key models in the lineup include:
- Grok 4.3 is the latest flagship model, leading the industry in non-hallucination rate and agentic tool calling. It supports both reasoning and non-reasoning modes with a 1M token context window, priced at $1.25 per million input tokens and $2.50 per million output tokens.
- Grok 4.20 offers reasoning and non-reasoning variants with multi-agent capabilities, enabling complex collaborative AI workflows.
- Grok Build 0.1 is a specialized coding model with a 256k context window, optimized for software development tasks.
All models support text, image, and structured output through a unified API compatible with OpenAI and Anthropic SDKs, making migration straightforward for developers.
Key Features
Grok offers several distinctive modes that set it apart from other AI assistants:
- Think and Big Brain modes activate chain-of-thought reasoning, allowing the model to break down complex problems step by step, self-correct errors, and evaluate multiple approaches before delivering an answer. Big Brain mode uses the full model for deeper analysis.
- DeepSearch enables real-time web and X (Twitter) search, synthesizing information from multiple sources to provide current, verified answers rather than relying on training data alone.
- Voice mode allows natural spoken conversation with the AI assistant.
- Grok Imagine generates and edits images from text descriptions, with a dedicated API for programmatic image creation.
Access and Pricing
Grok is available through multiple tiers. Free users get limited access to Grok models at grok.com and through the X platform. X Premium subscribers receive increased usage limits. SuperGrok, priced at $30 per month or $300 per year, provides expanded access with unlimited image generation, higher reasoning limits, and early access to new features. For developers, the xAI API offers pay-as-you-go pricing starting at $1.25 per million input tokens for Grok 4.3, with enterprise plans available for teams needing custom rate limits and dedicated support.
Developer Platform
The xAI API provides programmatic access to all Grok models through a single unified endpoint. Developers can integrate text, vision, voice, image generation, and video capabilities using one API key. The platform supports function calling, structured outputs, code execution, and the Model Context Protocol for third-party integrations. SDKs are available for Python, JavaScript, Go, and other languages. Enterprise customers can deploy through Microsoft Azure via the Azure AI Foundry catalog.
Safety and Responsibility
xAI publishes a Risk Management Framework for each major model release, detailing evaluations for autonomous capabilities, cybersecurity risks, and misuse potential. Grok models include content filtering and safety guardrails while being designed to be more willing to answer queries compared to some competitors. The company trains models using reinforcement learning at scale, refining chain-of-thought processes to improve accuracy and reduce hallucination.
