OpenAI: GPT-5.4 wins on more metrics (5 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 |
|---|---|---|
| Intelligence Index | 40.3 | 51.4✓ |
| Coding Index | 38.7 | 57.2✓ |
| GPQA Diamond | 89% | 92%✓ |
| Design Arena Elo | 1278 | 1303✓ |
| Speed (tokens/sec) | 77✓ | 61 |
| Latency | 529ms✓ | 945ms |
| Input price /M | $0.098✓ | $2.50 |
| Output price /M | $0.196✓ | $15.00 |
| Context window | 1.0M | 1.1M✓ |
| Capabilities | ReasoningToolsJSON | ReasoningToolsJSONVision |