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xAI
Released March 2026
Grok 4.20
Flagship speed, 2M context, low hallucination, agentic tool calling
Reasoning
Tool Use
Vision
About this model
Grok 4.20 is xAI's newest flagship model combining industry-leading speed with agentic tool calling capabilities. It features low hallucination rates and strict prompt adherence for precise responses. With a 2-million-token context window, it handles extensive documents and long conversations. Reasoning can be toggled via API parameters, and it supports structured outputs, native web search, and parallel tool calling.
Context Window
2M
Input Cost
$2/M
Output Cost
$6/M
Input Types
Text, Image