Compare AI Models

Comparing the specifications and intelligence benchmarks for Grok 3 Reasoning Beta, Grok 4 Fast (Reasoning).

Model	Intelligence	MMLU Pro	Context	GPQA	TTFT (s)	Speed (T/s)	Input Price (1M)	Output Price (1M)
Grok 3 Reasoning Beta xAI	21.6	-	-	-	-	-	$0.00	$0.00
Grok 4 Fast (Reasoning) xAI	35.1	85.0%	-	84.7%	3.06	162	$0.20	$0.50

Grok 3 Reasoning Beta vs Grok 4 Fast (Reasoning) Comparison 2026: Pricing & Benchmarks