Head to head
GPT-4.1 vs GPT-5.1
On a blended workload of one million input tokens and three million output tokens, GPT-4.1 is 1.2× cheaper than GPT-5.1.
| GPT-4.1 | GPT-5.1 | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input / MTok | $2 | $1.25 |
| Output / MTok | $8 | $10 |
| Cache read / MTok | $0.5 | $0.125 |
| Context window | 1,047,576 | — |
| Blended 1M in + 3M out | $26.00 | $31.25 |
| Status | ga | ga |