Model comparison
DeepSeek-V3.1 vs Gemini 3.5 Flash
Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 42.8 on the Noometry Index. DeepSeek-V3.1 costs 7.9× less per token, which makes it the better buy when Gemini 3.5 Flash's lead doesn't matter for your workload.
Last verified . 23 shared benchmarks.
DeepSeek
GoogleSummary
- They share 23 benchmarks with published results for both. DeepSeek-V3.1 scores higher in 0 categories and Gemini 3.5 Flash in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3.5 Flash leads 62.8 to 27.9.
- The biggest single-benchmark swing is SimpleBench: 40% for DeepSeek-V3.1 and 76.7% for Gemini 3.5 Flash.
- DeepSeek-V3.1 is cheaper at $0.25 / $0.95 per million input/output tokens, against $1.50 / $9 for Gemini 3.5 Flash.
- Gemini 3.5 Flash accepts more context: 1.05M tokens versus 164K.
- DeepSeek-V3.1 has downloadable open weights; the other is API-only.
Side by side
| DeepSeek-V3.1 | Gemini 3.5 Flash | |
|---|---|---|
| Provider | DeepSeek | |
| Noometry Index | 42.8 | 54.2 |
| Released | 2025-08-21 | 2026-05-19 |
| Weights | Open | Proprietary |
| Context window | 164K | 1.05M |
| Max output | 8K | 66K |
| Input $ / M tokens | $0.25 | $1.50 |
| Output $ / M tokens | $0.95 | $9 |
| Results tracked | 27 | 54 |
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Category by category
Coding Gemini 3.5 Flash leads
DeepSeek-V3.1: 40.3 (#144), Gemini 3.5 Flash: 49.4 (#49)
| Benchmark | DeepSeek-V3.1 | Gemini 3.5 Flash |
|---|---|---|
| WeirdML | 38.4% | 62.6% |
| LMArena Coding | 1417 | 1492 |
| SWE-bench Verified | — | 79.3% |
| DeepSWE | — | 37.4% |
| LMArena WebDev | — | 1499 |
| SciCode | — | 53.1% |
| ALE-Bench | — | 911.02 |
Agentic & Tool Use Not comparable
DeepSeek-V3.1: —, Gemini 3.5 Flash: 24.7 (#114)
| Benchmark | DeepSeek-V3.1 | Gemini 3.5 Flash |
|---|---|---|
| APEX-Agents | — | 27.5% |
| GBAEval | — | 6.7% |
| GDP.pdf | — | 14% |
| Vending-Bench 2 | — | 5,396 |
Reasoning Gemini 3.5 Flash leads
DeepSeek-V3.1: 27.9 (#110), Gemini 3.5 Flash: 62.8 (#18)
| Benchmark | DeepSeek-V3.1 | Gemini 3.5 Flash |
|---|---|---|
| SimpleBench | 40% | 76.7% |
| LMArena Hard Prompts | 1417 | 1488 |
| DTBench | 82.7% | 94.7% |
| LMCA | 24.3% | 47.1% |
| Epoch Capabilities Index | 139.92 | 154.46 |
| ForecastBench | 58 | 59 |
| ARC-AGI-2 | — | 72.1% |
| Kagi LLM Benchmark | 53.2% | — |
| NYT Connections (extended) | — | 92.6% |
| ARC-AGI-1 | — | 92.5% |
| CritPt | — | 13.1% |
| Chess Puzzles | — | 50% |
| EnigmaEval | — | 25.4% |
| EBR-Bench | — | 4.8% |
| Mystery Game Puzzles | — | 32% |
| Surface Evolver Bench | — | 58.1% |
Math Gemini 3.5 Flash leads
DeepSeek-V3.1: 38.9 (#122), Gemini 3.5 Flash: 60.7 (#36)
| Benchmark | DeepSeek-V3.1 | Gemini 3.5 Flash |
|---|---|---|
| LMArena Math | 1420 | 1504 |
| FrontierMath (Tiers 1-3) | — | 62.8% |
| FrontierMath Tier 4 | — | 26.8% |
| MathArena Final-Answer Competitions | — | 76.3% |
| OTIS Mock AIME 2024-2025 | — | 95.6% |
| ProofBench | — | 31% |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Tier 4 (v1) | — | 14.6% |
Knowledge Gemini 3.5 Flash leads
DeepSeek-V3.1: 43.7 (#90), Gemini 3.5 Flash: 66.3 (#11)
| Benchmark | DeepSeek-V3.1 | Gemini 3.5 Flash |
|---|---|---|
| LMArena Expert | 1405 | 1495 |
| GPQA Diamond | — | 92.8% |
| SimpleQA Verified | — | 66.2% |
| Vectara Hallucination Rate | 5.5% | — |
Multimodal Not comparable
DeepSeek-V3.1: —, Gemini 3.5 Flash: 45.7 (#15)
| Benchmark | DeepSeek-V3.1 | Gemini 3.5 Flash |
|---|---|---|
| LMArena Vision | — | 1310 |
| Blueprint-Bench 2 | — | 33.6% |
| LMArena Document | — | 1463 |
Multilingual Gemini 3.5 Flash leads
DeepSeek-V3.1: 51.6 (#106), Gemini 3.5 Flash: 57.0 (#13)
| Benchmark | DeepSeek-V3.1 | Gemini 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1400 | 1476 |
| LMArena Chinese | 1469 | 1526 |
| LMArena French | 1447 | 1490 |
| LMArena German | 1411 | 1492 |
| LMArena Japanese | 1378 | 1486 |
| LMArena Korean | 1337 | 1451 |
| LMArena Russian | 1405 | 1493 |
| LMArena Spanish | 1431 | 1480 |
Instruction Following Gemini 3.5 Flash leads
DeepSeek-V3.1: 73.9 (#110), Gemini 3.5 Flash: 77.0 (#30)
| Benchmark | DeepSeek-V3.1 | Gemini 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1400 | 1467 |
Long Context Gemini 3.5 Flash leads
DeepSeek-V3.1: 36.3 (#232), Gemini 3.5 Flash: 45.4 (#38)
| Benchmark | DeepSeek-V3.1 | Gemini 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1422 | 1482 |
| Fiction.LiveBench | 52.8% | — |
Writing & Preference Gemini 3.5 Flash leads
DeepSeek-V3.1: 60.3 (#98), Gemini 3.5 Flash: 65.5 (#47)
| Benchmark | DeepSeek-V3.1 | Gemini 3.5 Flash |
|---|---|---|
| LMArena Text | 1420 | 1482 |
| LMArena Creative Writing | 1401 | 1470 |
| LMArena Multi-Turn | 1408 | 1481 |
| EQ-Bench Creative Writing | 1436 | — |
| EQ-Bench 4 | — | 1087 |
Frequently asked questions
Is DeepSeek-V3.1 better than Gemini 3.5 Flash?
Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 42.8 on the Noometry Index. DeepSeek-V3.1 costs 7.9× less per token, which makes it the better buy when Gemini 3.5 Flash's lead doesn't matter for your workload.
Which is cheaper, DeepSeek-V3.1 or Gemini 3.5 Flash?
DeepSeek-V3.1 is cheaper. It lists at $0.25 per million input tokens and $0.95 per million output tokens; Gemini 3.5 Flash lists at $1.50 and $9.
Is DeepSeek-V3.1 or Gemini 3.5 Flash better for coding?
Gemini 3.5 Flash scores higher on coding benchmarks: 49.4 versus 40.3 in the Noometry coding category.
Which has the bigger context window?
Gemini 3.5 Flash does, with 1.05M tokens against 164K.
How many benchmarks do DeepSeek-V3.1 and Gemini 3.5 Flash share?
23 benchmarks have published results for both models. DeepSeek-V3.1 has 27 scored results on Noometry and Gemini 3.5 Flash has 54.