DeepSeek: DeepSeek V4 Flash wins on more metrics (8 of 9), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | DeepSeek: DeepSeek V4 Flash | OpenAI: GPT-5.4 Nano |
|---|---|---|
| Intelligence Index | 40.3✓ | 38.2 |
| Coding Index | 38.7 | 43.9✓ |
| GPQA Diamond | 89%✓ | 82% |
| Design Arena Elo | 1278✓ | — |
| Speed (tokens/sec) | 68✓ | 59 |
| Latency | 550ms✓ | 553ms |
| Input price /M | $0.098✓ | $0.200 |
| Output price /M | $0.196✓ | $1.25 |
| Context window | 1.0M✓ | 400K |
| Capabilities | ReasoningToolsJSON | ReasoningToolsJSONVision |