OpenAI: GPT-5.5 wins on more metrics (5 of 9), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | Google: Gemini 3.5 Flash | OpenAI: GPT-5.5 |
|---|---|---|
| Intelligence Index | 54.8 | 56.7✓ |
| Coding Index | 43.9 | 56.2✓ |
| GPQA Diamond | 92% | 93%✓ |
| Design Arena Elo | 1329 | 1355✓ |
| Speed (tokens/sec) | 165✓ | 40 |
| Latency | 1.8s✓ | 3.1s |
| Input price /M | $1.50✓ | $5.00 |
| Output price /M | $9.00✓ | $30.00 |
| Context window | 1.0M | 1.1M✓ |
| Capabilities | ReasoningToolsJSONVisionAudio | ReasoningToolsJSONVision |