Gemini 3.1 Pro Preview vs GPT-5.5
For product management work, compared on the PM Index.
- GPT-5.5 leads on the PM Index (62.9 vs 57.4).
- Gemini 3.1 Pro Preview is cheaper ($4.50 vs $11.25 per 1M tokens).
- Gemini 3.1 Pro Preview is faster (123 vs 68 tok/s).
| Metric | Gemini 3.1 Pro Preview | GPT-5.5 |
|---|---|---|
| PM Index | 57.4 | 62.9 |
| AA Intelligence | 57.2 | 60.2 |
| AA Coding | 55.5 | 59.1 |
| AA Agentic | 59.1 | 74.1 |
| Blended $/1M | $4.50 | $11.25 |
| Output tok/s | 123 | 68 |