Deepseek v4 Flash Vision vs GPT-5.5 Pro
Deepseek v4 Flash Vision 
GPT-5.5 Pro Verdict
- GPT-5.5 Pro (xhigh) leads on quality: 67.1 vs 59.8.
- Deepseek v4 Flash Vision (max) is stronger in agents & tools, composite, knowledge, long context, multimodal.
- GPT-5.5 Pro (xhigh) is stronger in reasoning, maths.
- Deepseek v4 Flash Vision (max) is 258× cheaper ($0.262 vs $67.50 per 1M blended).
- Deepseek v4 Flash Vision (max) streams 53.7× faster (215 vs 4 tokens per second).
| Metric | Deepseek v4 Flash Vision (max) | GPT-5.5 Pro (xhigh) |
|---|---|---|
| BenchLeader Index | 59.8 | 67.1 |
| Agents & tools score | 69.9 | – |
| Composite score | 73.4 | – |
| Knowledge score | 55.8 | – |
| Long context score | 67.1 | – |
| Multimodal score | 59.2 | – |
| Reasoning score | 62.9 | 80.1 |
| Maths score | – | 74.5 |
| Blended price $/M | $0.262 | $67.50 |
| Output speed | 215 tok/s | 4 tok/s |
| Time to first answer | 10.4 s | 3.5 s |
| Context window | 1M | 1.1M |
| FrontierMath Tiers 1–3 | – | 87.7% |
| FrontierMath Tier 4 | – | 78.0% |
| AA Intelligence Index | 35.0 | – |
| AA-LCR | 81.3% | – |
| MMMU-Pro | 74.8% | – |
| AA-Omniscience | -17.6 | – |
| GPQA Diamond (AA) | 91.3% | – |
| Humanity's Last Exam (AA) | 34.5% | – |
| SciCode (AA) | 49.6% | – |
| ARC-AGI-1 | – | 95.0% |
| ARC-AGI-2 | – | 84.2% |
| CritPt | 10.9% | 30.6% |
| GDPval (AA) | 53.9% | – |
| τ²-Bench Banking (AA) | 41.0% | – |
| LMCA | – | 53.9% |
| DTBench | – | 96.0% |
Data as of 2026-09-19. Best configuration of each model; every score links to its source on the model pages.
Deepseek v4 Flash Vision vs GPT-5.5 Pro: questions
- Is Deepseek v4 Flash Vision better than GPT-5.5 Pro?
- GPT-5.5 Pro (xhigh) leads on quality: 67.1 vs 59.8. The BenchLeader Index combines every independent quality benchmark; GPT-5.5 Pro (xhigh) is ahead overall as of 2026-09-19, but check the category scores for your use.
- Which is cheaper, Deepseek v4 Flash Vision or GPT-5.5 Pro?
- Deepseek v4 Flash Vision is cheaper: $0.262 against $67.50 per million tokens, blended at three input tokens per output token.
- Which is faster, Deepseek v4 Flash Vision or GPT-5.5 Pro?
- Deepseek v4 Flash Vision streams faster: 215 against 4 output tokens per second.
- Which has the larger context window?
- GPT-5.5 Pro accepts more context: 1.1M against 1M tokens.