OpenAI: GPT-5.5 wins on more metrics (6 of 9), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | OpenAI: GPT-5.5 | OpenAI: o4 Mini Deep Research |
|---|---|---|
| Intelligence Index | 56.7✓ | — |
| Coding Index | 56.2✓ | — |
| GPQA Diamond | 93%✓ | — |
| Design Arena Elo | 1354✓ | — |
| Speed (tokens/sec) | 37 | 120✓ |
| Latency | 4.0s✓ | 10.2s |
| Input price /M | $5.00 | $2.00✓ |
| Output price /M | $30.00 | $8.00✓ |
| Context window | 1.1M✓ | 200K |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSONVision |