Google: Gemini 3.1 Pro Preview wins on more metrics (5 of 8), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | Google: Gemini 3.1 Pro Preview | OpenAI: GPT-5.5 |
|---|---|---|
| Intelligence Index | — | — |
| Coding Index | 39.4✓ | — |
| GPQA Diamond | 89% | 93%✓ |
| Design Arena Elo | 1346 | 1348✓ |
| Speed (tokens/sec) | 91✓ | 40 |
| Latency | 3.3s✓ | 3.5s |
| Input price /M | $2.00✓ | $5.00 |
| Output price /M | $12.00✓ | $30.00 |
| Context window | 1.0M | 1.1M✓ |
| Capabilities | ReasoningToolsJSONVisionAudio | ReasoningToolsJSONVision |