Grok 4
LLMLLMMultimodalMultimodalReasoningReasoningTool-UsingTool-Using
xAI fourth-generation flagship model with native tool use (function calling) and real-time search integration. Available in standard and Heavy (SuperGrok Heavy) tiers. Released July 9, 2025.
Technical specification
Context window
License
Tools
Fine-tuning
Weights access
Knowledge cutoff
Last updated: May 2, 2026
Modalities
Input
Text
Image
Output
Text
Capabilities
9Reasoning★
Reasoning
Multi-step reasoning★
Reasoning
Coding★
Coding
Image understanding★
Vision
Multilingual★
Language
Long context★
Reasoning
Planning★
Planning
Function Calling
Planning
Structured output★
Structured gen.
Architecture and technologies
Core Architecture
5Sources
Link1Documentation1Website1Link1