DeepSeek: DeepSeek V4 Flash wins on more metrics (6 of 9), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | DeepSeek: DeepSeek V4 Flash | OpenAI: GPT-5.1 |
|---|---|---|
| Intelligence Index | 46.0 | 47.7✓ |
| Coding Index | 39.8 | 44.7✓ |
| GPQA Diamond | 87% | 87%✓ |
| Design Arena Elo | 1278✓ | 1249 |
| Speed (tokens/sec) | 85✓ | 67 |
| Latency | 544ms✓ | 1.0s |
| Input price /M | $0.098✓ | $1.25 |
| Output price /M | $0.196✓ | $10.00 |
| Context window | 1.0M✓ | 400K |
| Capabilities | ReasoningToolsJSON | ReasoningToolsJSONVision |