OpenAI: GPT-5.4 Nano wins on more metrics (5 of 9), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | OpenAI: GPT-5.4 Nano | xAI: Grok 4.3 |
|---|---|---|
| Intelligence Index | 38.2✓ | 37.6 |
| Coding Index | 43.9✓ | 41.0 |
| GPQA Diamond | 82% | 90%✓ |
| Design Arena Elo | — | 1255✓ |
| Speed (tokens/sec) | 59 | 77✓ |
| Latency | 553ms✓ | 669ms |
| Input price /M | $0.200✓ | $1.25 |
| Output price /M | $1.25✓ | $2.50 |
| Context window | 400K | 1M✓ |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSONVision |