Grok-1.5 vs R1 1776

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

•R1 1776 has the higher intelligence index (95.4 vs 50.3)

	Grok-1.5	R1 1776
Intelligence index	50.3	95.4
Developer	xAI	Perplexity
Type	LLM	LLM
Access	API only	—
Context window	—	—
Input price	—	$0.00 / 1M
Output price	—	$0.00 / 1M
Speed	—	—
Released	March 28, 2024	February 18, 2025
Parameters	—	—
Input modalities	—	—
Output modalities	—	—

Grok-1.5 details R1 1776 details