DeepSeek: DeepSeek V4 Flash 0731 vs OpenAI: GPT-5.5
OpenAI: GPT-5.5 wins on more metrics (5 of 7), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | DeepSeek: DeepSeek V4 Flash 0731 | OpenAI: GPT-5.5 |
|---|---|---|
| Intelligence Index | 49.9 | 54.8✓ |
| Coding Index | 69.1 | 74.9✓ |
| GPQA Diamond | 91% | 94%✓ |
| Design Arena Elo | 1246 | 1282✓ |
| Speed (tokens/sec) | — | — |
| Latency | — | — |
| Input price /M | $0.140✓ | $5.00 |
| Output price /M | $0.280✓ | $30.00 |
| Context window | 1.0M | 1.1M✓ |
| Capabilities | ReasoningToolsJSON | ReasoningToolsJSONVision |
Frequently asked
Is DeepSeek: DeepSeek V4 Flash 0731 better than OpenAI: GPT-5.5?
OpenAI: GPT-5.5 wins on more metrics (5 of 7), but the right pick depends on what you optimize for — see the breakdown below.
What are the biggest differences between DeepSeek: DeepSeek V4 Flash 0731 and OpenAI: GPT-5.5?
The table on this page compares DeepSeek: DeepSeek V4 Flash 0731 and OpenAI: GPT-5.5 metric by metric — intelligence benchmarks, coding score, speed, latency, context window and per-token price — with the winner marked on each row. Data refreshes hourly.