Claude Opus 5.5 vs Deepseek v4 Flash Vision
Claude Opus 5.5 
Deepseek v4 Flash Vision Verdict
- Claude Opus 5.5 (thinking) leads on quality: 70.7 vs 59.3.
- Claude Opus 5.5 (thinking) is stronger in composite, knowledge, long context, multimodal, reasoning.
- Deepseek v4 Flash Vision (max) is stronger in agents & tools.
- Deepseek v4 Flash Vision (max) is 31× cheaper ($0.262 vs $8.00 per 1M blended).
- Deepseek v4 Flash Vision (max) streams 4.8× faster (231 vs 48 tokens per second).
| Metric | Claude Opus 5.5 (thinking) | Deepseek v4 Flash Vision (max) |
|---|---|---|
| BenchLeader Index | 70.7 | 59.3 |
| Composite score | 95.0 | 71.7 |
| Knowledge score | 85.0 | 55.2 |
| Long context score | 68.5 | 66.8 |
| Multimodal score | 71.9 | 58.7 |
| Reasoning score | 95.0 | 61.6 |
| Agents & tools score | – | 69.9 |
| Blended price $/M | $8.00 | $0.262 |
| Output speed | 48 tok/s | 231 tok/s |
| Time to first answer | 4.2 s | 9.8 s |
| Context window | 1M | 1M |
| AA Intelligence Index | 57.6 | 34.8 |
| AA-LCR | 84.7% | 81.3% |
| MMMU-Pro | 87.7% | 74.8% |
| AA-Omniscience | 46.4 | -17.6 |
| GPQA Diamond (AA) | – | 91.3% |
| Humanity's Last Exam (AA) | 61.4% | 34.5% |
| SciCode (AA) | 66.9% | 49.6% |
| CritPt | 31.7% | 10.9% |
| GDPval (AA) | 67.3% | 51.7% |
| τ²-Bench Banking (AA) | – | 41.0% |
| Terminal-Bench 4.0 (AA) | 59.6% | 12.1% |
| Terminal-Bench 2.1 (AA) | – | 74.2% |
| AutomationBench | 69.5% | – |
| GDP.pdf | 26.2% | – |
| Harvey LAB | 91.2% | – |
| AA-Omniscience: accuracy | 66.2% | 38.6% |
| AA-Omniscience: non-hallucination | 41.4% | 8.5% |
| AA-Briefcase | 1822 | – |
Data as of 2026-09-22. Best configuration of each model; every score links to its source on the model pages.
Claude Opus 5.5 vs Deepseek v4 Flash Vision: questions
- Is Claude Opus 5.5 better than Deepseek v4 Flash Vision?
- Claude Opus 5.5 (thinking) leads on quality: 70.7 vs 59.3. The BenchLeader Index combines every independent quality benchmark; Claude Opus 5.5 (thinking) is ahead overall as of 2026-09-22, but check the category scores for your use.
- Which is cheaper, Claude Opus 5.5 or Deepseek v4 Flash Vision?
- Deepseek v4 Flash Vision is cheaper: $0.262 against $8.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Opus 5.5 or Deepseek v4 Flash Vision?
- Deepseek v4 Flash Vision streams faster: 231 against 48 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.