DeepSeek: DeepSeek V4 Pro vs OpenAI: GPT-5.5
DeepSeek: DeepSeek V4 Pro 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 Pro | OpenAI: GPT-5.5 |
|---|---|---|
| Intelligence Index | 44.3 | 54.8✓ |
| Coding Index | 59.4 | 74.9✓ |
| GPQA Diamond | 89% | 94%✓ |
| Design Arena Elo | 1324✓ | 1300 |
| Speed (tokens/sec) | 55✓ | 50 |
| Latency | 573ms✓ | 2.5s |
| Input price /M | $0.435✓ | $5.00 |
| Output price /M | $0.870✓ | $30.00 |
| Context window | 1.0M | 1.1M✓ |
| Capabilities | ReasoningToolsJSON | ReasoningToolsJSONVision |