OpenAI: GPT-5 Nano wins on more metrics (6 of 8), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | OpenAI: GPT-5 Nano | Upstage: Solar Pro 3 |
|---|---|---|
| Intelligence Index | 25.9 | 25.9 |
| Coding Index | 22.9✓ | 13.3 |
| GPQA Diamond | 67% | 72%✓ |
| Design Arena Elo | 1146✓ | — |
| Speed (tokens/sec) | 107✓ | 75 |
| Latency | 2.1s | 531ms✓ |
| Input price /M | $0.050✓ | $0.150 |
| Output price /M | $0.400✓ | $0.600 |
| Context window | 400K✓ | 128K |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSON |