Head to head
GPT-4o vs GPT-5.1
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-4o | GPT-5.1 | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input / MTok | $2.5 | $1.25 |
| Output / MTok | $10 | $10 |
| Cache read / MTok | $1.25 | $0.125 |
| Context window | 128,000 | — |
| Blended 1M in + 3M out | $32.50 | $31.25 |
| Status | ga | ga |