OpenAI: GPT-5.4 Pro and OpenAI: GPT-5.5 Pro are evenly matched; the right pick depends on your priorities.
| Metric | OpenAI: GPT-5.4 Pro | OpenAI: GPT-5.5 Pro |
|---|---|---|
| Intelligence Index | — | — |
| Coding Index | — | — |
| GPQA Diamond | — | — |
| Design Arena Elo | — | — |
| Speed (tokens/sec) | 4 | 14✓ |
| Latency | 25.3s✓ | 37.7s |
| Input price /M | $30.00 | $30.00 |
| Output price /M | $180.00 | $180.00 |
| Context window | 1.1M | 1.1M |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSONVision |