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Grok-1.5V vs Grok-4 Heavy

xAI vs xAI — benchmarks, pricing, and capabilities side by side.

  • Grok-4 Heavy has the higher intelligence index (89.3 vs 71.3)
Grok-1.5VGrok-4 Heavy
Intelligence index71.389.3
DeveloperxAIxAI
TypeMultimodalMultimodal
AccessAPI onlyAPI only
Context window
Input price
Output price
Speed
ReleasedApril 12, 2024July 9, 2025
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