Head to head
GPT-5.1 vs GPT-4o
On a blended workload of one million input tokens and three million output tokens, GPT-5.1 is 1.0× cheaper than GPT-4o.
| GPT-5.1 | GPT-4o | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input / MTok | $1.25 | $2.5 |
| Output / MTok | $10 | $10 |
| Cache read / MTok | $0.125 | $1.25 |
| Context window | — | 128,000 |
| Blended 1M in + 3M out | $31.25 | $32.50 |
| Status | ga | ga |