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Grok 4.5 vs Composer 2.5

List rates and scores as of 2026-09-20. Lower $/MTok is cheaper. Higher scores rank better. Input edge: Composer 2.5 Output edge: Composer 2.5

Model A

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

Model B

Composer 2.5

Cursor

cursor/composer-2.5

tools

List input$0.5
List output$2.50
Context200K
Offers3
Arena codeN/A
AA intelligenceN/A
AA codingN/A
AA agenticN/A

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

Score sources on /benchmarks.