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Grok 4 (xAI) vs Grok 4.5

List rates and scores as of 2026-09-20. Lower $/MTok is cheaper. Higher scores rank better. Input edge: Grok 4 (xAI) Output edge: Grok 4 (xAI)

Model A

Grok 4 (xAI)

xAI

xai/grok-4

reasoningtools

List input$1.25
List output$2.50
Context256K
Offers14
Arena codeN/A
AA intelligenceN/A
AA codingN/A
AA agenticN/A

On plans: Grok Premium (X Premium), Grok Premium+ (X Premium+), SuperGrok

Model B

Grok 4.5

xAI

xai/grok-4-5

reasoningtools

List input$2
List output$6
Context1M
Offers31
Arena code1555
AA intelligence38.8
AA coding72.4
AA agentic41.2

On plans: Cursor Business, Cursor Pro, Cursor Start, Cursor Ultra

Score sources on /benchmarks.