Head to head
Gemini 3.5 Flash vs GPT-5.1
On a blended workload of one million input tokens and three million output tokens, Gemini 3.5 Flash is 1.1× cheaper than GPT-5.1.
| Gemini 3.5 Flash | GPT-5.1 | |
|---|---|---|
| Provider | OpenAI | |
| Input / MTok | $1.5 | $1.25 |
| Output / MTok | $9 | $10 |
| Cache read / MTok | $0.15 | $0.125 |
| Context window | — | — |
| Blended 1M in + 3M out | $28.50 | $31.25 |
| Status | ga | ga |