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xAI
Released April 2026
Grok 4.3
Always-on reasoning, 1M context, agentic workflows
Reasoning
Tool Use
Vision
About this model
Grok 4.3 is xAI's reasoning model tuned for agentic workflows, instruction-following, and applications requiring high factual accuracy. Reasoning is always active and cannot be disabled. Its 1-million-token context window is designed for long-document analysis and multi-step tasks, with text and image input.
Context Window
1M
Input Cost
$1.25/M
Output Cost
$2.50/M
Input Types
Text, Image