Head to head

GPT-5.1 vs GPT-5

On a blended workload of one million input tokens and three million output tokens, GPT-5 is line-ball with GPT-5.1.

GPT-5.1GPT-5
Provider OpenAI OpenAI
Input / MTok $1.25 $1.25
Output / MTok $10 $10
Cache read / MTok $0.125 $0.125
Context window
Blended 1M in + 3M out $31.25 $31.25
Status ga ga

GPT-5.1 detail   GPT-5 detail