Gemini 2.5 Flash vs GPT-5.1
Gemini 2.5 Flash costs 4.0x less per output token.
Which Is Cheaper?
At 1M tokens/mo
Gemini 2.5 Flash: $1
GPT-5.1: $6
At 10M tokens/mo
Gemini 2.5 Flash: $14
GPT-5.1: $56
At 100M tokens/mo
Gemini 2.5 Flash: $140
GPT-5.1: $563
Which Performs Better?
| Test | Gemini 2.5 Flash | GPT-5.1 |
|---|---|---|
| Structured Output | — | — |
| Strategic Analysis | — | — |
| Constrained Rewriting | — | — |
| Creative Problem Solving | — | — |
| Tool Calling | — | — |
| Faithfulness | — | — |
| Classification | — | — |
| Long Context | — | — |
| Safety Calibration | — | — |
| Persona Consistency | — | — |
| Agentic Planning | — | — |
| Multilingual | — | — |