Grok 4.1
LLMLLMMultimodalMultimodalReasoningReasoningTool-UsingTool-Using
Incremental update to Grok 4 with improved reasoning, multimodal understanding, and reduced hallucination rates. Fast variant (2M token context) available for agentic workflows. Released November 17, 2025.
Technical specification
Context window
License
Tools
Fine-tuning
Weights access
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.