DeepSeek V4.1 Flash vs Gemini 3.5 Flash
DeepSeek V4.1 Flash 
Gemini 3.5 Flash Verdict
- Gemini 3.5 Flash (medium) leads on quality: 64.2 vs 61.9.
- DeepSeek V4.1 Flash (max) is stronger in coding, composite, long context, reasoning.
- Gemini 3.5 Flash (medium) is stronger in agents & tools, knowledge, multimodal, human preference, instruction following, maths.
- DeepSeek V4.1 Flash (max) is 13× cheaper ($0.262 vs $3.38 per 1M blended).
| Metric | DeepSeek V4.1 Flash (max) | Gemini 3.5 Flash (medium) |
|---|---|---|
| BenchLeader Index | 61.9 | 64.2 |
| Agents & tools score | 59.6 | 67.9 |
| Coding score | 68.9 | 58.7 |
| Composite score | 74.5 | 71.6 |
| Knowledge score | 61.7 | 74.1 |
| Long context score | 68.5 | 63.5 |
| Multimodal score | 61.4 | 67.5 |
| Reasoning score | 69.5 | 64.2 |
| Human preference score | – | 67.4 |
| Instruction following score | – | 72.7 |
| Maths score | – | 67.2 |
| Blended price $/M | $0.262 | $3.38 |
| Output speed | 215 tok/s | 201 tok/s |
| Time to first answer | 10.5 s | 13.9 s |
| Context window | 1M | 1.0M |
| LMArena Text | – | 1474 |
| LMArena Hard Prompts | – | 1493 |
| LMArena Coding | – | 1502 |
| LMArena WebDev | 1614 | 1492 |
| LMArena Vision | – | 1307 |
| LMArena Agent | 4.9 | – |
| LiveBench | 81.1% | – |
| LiveBench Reasoning | 86.7% | – |
| LiveBench Coding | 80.0% | – |
| LiveBench Agentic Coding | 77.3% | – |
| LiveBench Mathematics | 93.3% | – |
| LiveBench Data Analysis | 79.3% | – |
| LiveBench Language | 81.2% | – |
| LiveBench Instruction Following | 70.0% | – |
| AA Intelligence Index | 39.5 | 33.6 |
| IFBench | – | 74.6% |
| AA-LCR | 84.0% | 74.3% |
| MMMU-Pro | 77.0% | 83.9% |
| AA-Omniscience | -5.3 | 20.8 |
| Terminal-Bench Hard | – | 39.4% |
| GPQA Diamond (AA) | – | 92.1% |
| Humanity's Last Exam (AA) | 39.3% | 41.3% |
| SciCode (AA) | 51.9% | – |
| τ²-Bench Telecom (AA) | – | 95.6% |
| CritPt | 14.3% | 10.9% |
| GDPval (AA) | 56.6% | – |
| LMArena Maths | – | 1478 |
| LMArena Creative Writing | – | 1466 |
| LMArena Instruction Following | – | 1463 |
| LMArena Multi-turn | – | 1476 |
| LMArena Longer Queries | – | 1478 |
| LMArena Document | – | 1461 |
| Surface Evolver Bench | – | 58.1% |
| DeepSWE | – | 37.4% |
| GDP.pdf | – | 14.0% |
Data as of 2026-09-19. Best configuration of each model; every score links to its source on the model pages.
DeepSeek V4.1 Flash vs Gemini 3.5 Flash: questions
- Is DeepSeek V4.1 Flash better than Gemini 3.5 Flash?
- Gemini 3.5 Flash (medium) leads on quality: 64.2 vs 61.9. The BenchLeader Index combines every independent quality benchmark; Gemini 3.5 Flash (medium) is ahead overall as of 2026-09-19, but check the category scores for your use.
- Is DeepSeek V4.1 Flash better than Gemini 3.5 Flash for coding?
- DeepSeek V4.1 Flash scores higher in coding (69 vs 59 on the category index, where 50 is average).
- Is DeepSeek V4.1 Flash better than Gemini 3.5 Flash for agentic tasks?
- Gemini 3.5 Flash scores higher in agentic tasks (68 vs 60 on the category index, where 50 is average).
- Which is cheaper, DeepSeek V4.1 Flash or Gemini 3.5 Flash?
- DeepSeek V4.1 Flash is cheaper: $0.262 against $3.38 per million tokens, blended at three input tokens per output token.
- Which is faster, DeepSeek V4.1 Flash or Gemini 3.5 Flash?
- DeepSeek V4.1 Flash streams faster: 215 against 201 output tokens per second.
- Which has the larger context window?
- Gemini 3.5 Flash accepts more context: 1.0M against 1M tokens.