AI model matchup
GPT-5.5 Pro vs DeepSeek-V4-Flash-0731
A side-by-side look at published capability scores, listed API pricing, speed, context, and license - to help you decide which trade-offs fit your work.
GPT-5.5 ProvsDeepSeek-V4-Flash-0731
DeepSeek-V4-Flash-0731 leads the RankLLMs Index by 0.6 points (46.1 vs 45.5). Verified API Pricing: $30.00 (GPT-5.5 Pro) vs Free/Open Source (DeepSeek-V4-Flash-0731) per 1M tokens.
Capability profile
Speed duel
tpsPrice duel
$/1MShorter bar = cheaper. Blended per 1M tokens.
| Metric | GPT-5.5 Pro | DeepSeek-V4-Flash-0731 |
|---|---|---|
| RankLLMs Overall Score | 45.5 pts | 46.1 pts ▲ |
| Reasoning | 45.4 ▲ | 43.3 |
| Coding | 48.6 ▲ | 36.2 |
| Agentic Tool Use | 28.5 | 33.2 ▲ |
| Code Arena Elo | null | 2407 |
| Inference Speed | 85 tps | 227 tps ▲ |
| API Price (per 1M tokens) | $30.00 | Free/Open Source |
| Context Window | 1.1M | 1M |
| License | Proprietary | Open Source |
| Global Rank | #46 | #44 ▲ |
Decision notes
What the numbers suggest
DeepSeek-V4-Flash-0731 leads the RankLLMs overall score by 0.6 points. DeepSeek-V4-Flash-0731 has the lower listed API rate (Free/Open Source per 1M tokens).
Treat the overall index as a starting point, then prioritize the benchmark that resembles your task. Published scores and provider pricing can change; this comparison does not represent a first-party test of either model.
- Overall index
- DeepSeek-V4-Flash-0731 leads
- 45.5 to 46.1 pts
- Coding score
- GPT-5.5 Pro leads
- 48.6 to 36.2 pts
- Reasoning score
- GPT-5.5 Pro leads
- 45.4 to 43.3 pts
- Agentic score
- DeepSeek-V4-Flash-0731 leads
- 28.5 to 33.2 pts
Choose by workload
Which profile fits your use?
OpenAI
Consider GPT-5.5 Pro when
your workload gives more weight to the higher listed coding score, the higher listed reasoning score. Compare those signals with your own task mix, latency needs, and budget.
View GPT-5.5 Pro profileDeepSeek
Consider DeepSeek-V4-Flash-0731 when
your workload gives more weight to the higher overall index score, the lower listed API rate. Compare those signals with your own task mix, latency needs, and budget.
View DeepSeek-V4-Flash-0731 profile