OpenAI: GPT-5.5 wins on more metrics (8 of 8), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | OpenAI: GPT-5.5 | OpenAI: GPT-5.5 Pro |
|---|---|---|
| Intelligence Index | 56.7✓ | — |
| Coding Index | 56.2✓ | — |
| GPQA Diamond | 93%✓ | — |
| Design Arena Elo | 1354✓ | — |
| Speed (tokens/sec) | 37✓ | 17 |
| Latency | 4.0s✓ | 50.2s |
| Input price /M | $5.00✓ | $30.00 |
| Output price /M | $30.00✓ | $180.00 |
| Context window | 1.1M | 1.1M |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSONVision |