OpenAI: GPT-5.4 Nano wins on more metrics (7 of 8), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | OpenAI: GPT-3.5 Turbo 16k | OpenAI: GPT-5.4 Nano |
|---|---|---|
| Intelligence Index | — | 44.0✓ |
| Coding Index | — | 43.9✓ |
| GPQA Diamond | — | 82%✓ |
| Design Arena Elo | — | — |
| Speed (tokens/sec) | 35 | 68✓ |
| Latency | 425ms✓ | 529ms |
| Input price /M | $3.00 | $0.200✓ |
| Output price /M | $4.00 | $1.25✓ |
| Context window | 16K | 400K✓ |
| Capabilities | ToolsJSON | ReasoningToolsJSONVision |