Grok

Grok 4.5 is xAI's flagship model, shipped July 8, 2026 with public rollout July 9. It has a 500K-token context window (with a high-context surcharge above 200K) and configurable reasoning effort (low/medium/high, defaulting to high). xAI trained it in partnership with Cursor specifically to handle long-running jobs across multiple repositories with minimal human intervention across hundreds of tool calls.

Grok is xAI's AI assistant integrated into X (formerly Twitter) with real-time access to platform data and a more conversational, edgy tone. Available models include Grok-1 (March 2024), Grok-2 (re-released as Grok 2.5 in August 2026 under source-available license), Grok 3 Beta (February 2026, 314B parameters, 128K token context), Grok 4 (July 2026) with advanced multi-agent architecture, and Grok 4.1 (latest) with improved real-world reasoning and emotional intelligence. Provides answers, analysis, and creative content generation with direct integration into X platform. Available through X...

Grok Build is an agentic command-line coding assistant from xAI that understands natural-language project descriptions, generates and edits code across files, runs commands, and iterates until tasks are complete. The beta released on May 14, 2026 emphasizes deep codebase reasoning, fast iteration loops, and tight integration with xAI's Grok models.