OpenAI: GPT-5.4 Nano wins on more metrics (6 of 9), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | MoonshotAI: Kimi K2.6 | OpenAI: GPT-5.4 Nano |
|---|---|---|
| Intelligence Index | — | 38.2✓ |
| Coding Index | 38.4 | 43.9✓ |
| GPQA Diamond | 79% | 82%✓ |
| Design Arena Elo | 1360✓ | — |
| Speed (tokens/sec) | 151✓ | 66 |
| Latency | 348ms✓ | 614ms |
| Input price /M | $0.680 | $0.200✓ |
| Output price /M | $3.41 | $1.25✓ |
| Context window | 262K | 400K✓ |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSONVision |