# DeepSeek V4.1 Flash vs Gemini 3.1 Pro Preview

> Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 50.3 on the Noometry Index. DeepSeek V4.1 Flash costs 17× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/deepseek-v4-1-flash-vs-gemini-3-1-pro-preview
- Last updated: 2026-10-10
- Shared benchmarks: 24

## Summary

- They share 24 benchmarks with published results for both. DeepSeek V4.1 Flash scores higher in 2 categories and Gemini 3.1 Pro Preview in 6 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Gemini 3.1 Pro Preview leads 71.8 to 41.6.
- The biggest single-benchmark swing is ProofBench: 54% for DeepSeek V4.1 Flash and 26% for Gemini 3.1 Pro Preview.
- DeepSeek V4.1 Flash is cheaper at $0.15 / $0.60 per million input/output tokens, against $2 / $12 for Gemini 3.1 Pro Preview.
- Gemini 3.1 Pro Preview accepts more context: 1.05M tokens versus 1M.
- DeepSeek V4.1 Flash has downloadable open weights; the other is API-only.

## Snapshot

| | DeepSeek V4.1 Flash | Gemini 3.1 Pro Preview |
|---|---|---|
| Provider | DeepSeek | Google |
| Noometry Index | 50.3 | 56.7 |
| Rank | 40 | 20 |
| Context | 1M | 1.05M |
| Input $/M | $0.15 | $2 |
| Output $/M | $0.60 | $12 |
| Weights | Open | Proprietary |

## Coding

- DeepSeek V4.1 Flash: 52.8 (#29)
- Gemini 3.1 Pro Preview: 42.7 (#88)

| Benchmark | DeepSeek V4.1 Flash | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena WebDev | 1620 | 1446 |
| SciCode | 51.9% | 58.9% |
| LMArena Coding | 1511 | 1483 |
| ALE-Bench | 1,092 | 1,161 |
| SWE-bench Verified | — | 75.6% |
| DeepSWE | — | 11.7% |
| GSO | — | 22.6% |
| WeirdML | — | 72.1% |
| MirrorCode | — | 8.9% |
| AlgoTune | — | 2.02 |

## Agentic & Tool Use

- DeepSeek V4.1 Flash: —
- Gemini 3.1 Pro Preview: 37.7 (#33)

| Benchmark | DeepSeek V4.1 Flash | Gemini 3.1 Pro Preview |
|---|---|---|
| Terminal-Bench | — | 80.2% |
| APEX-Agents | — | 35.3% |
| τ²-bench Banking | — | 26% |
| DeepResearch Bench | — | 47.8% |
| PostTrainBench | — | 22% |
| BALROG | — | 57% |
| ExploitBench | — | 26.1% |
| GBAEval | — | 0.8% |
| GDP.pdf | — | 17% |
| LMArena Search | — | 1211 |
| METR Time Horizons | — | 77% |
| Vending-Bench 2 | — | 3,774 |

## Reasoning

- DeepSeek V4.1 Flash: 46.2 (#39)
- Gemini 3.1 Pro Preview: 71.7 (#9)

| Benchmark | DeepSeek V4.1 Flash | Gemini 3.1 Pro Preview |
|---|---|---|
| NYT Connections (extended) | 89.6% | 97.4% |
| CritPt | 14.3% | 17.7% |
| LMArena Hard Prompts | 1485 | 1484 |
| DTBench | 89.9% | 97.1% |
| LMCA | 47% | 53.8% |
| Epoch Capabilities Index | 155.01 | 154.92 |
| ARC-AGI-2 | — | 77.1% |
| SimpleBench | — | 79.6% |
| ARC-AGI-1 | — | 98% |
| Chess Puzzles | — | 55% |
| EnigmaEval | — | 36.8% |
| Thematic Generalization | — | 79.4% |
| EBR-Bench | — | 14.3% |
| Mystery Game Puzzles | — | 34% |
| Surface Evolver Bench | 46.3% | — |
| ForecastBench | — | 59 |

## Math

- DeepSeek V4.1 Flash: 48.4 (#52)
- Gemini 3.1 Pro Preview: 61.8 (#28)

| Benchmark | DeepSeek V4.1 Flash | Gemini 3.1 Pro Preview |
|---|---|---|
| ProofBench | 54% | 26% |
| LMArena Math | 1493 | 1485 |
| FrontierMath (Tiers 1-3) | — | 59.6% |
| FrontierMath Tier 4 | — | 26.8% |
| MathArena Final-Answer Competitions | — | 86.5% |
| OTIS Mock AIME 2024-2025 | — | 95.6% |
| FrontierMath (Feb 2025 set) | — | 36.9% |
| FrontierMath Tier 4 (v1) | — | 16.7% |

## Knowledge

- DeepSeek V4.1 Flash: 41.6 (#97)
- Gemini 3.1 Pro Preview: 71.8 (#3)

| Benchmark | DeepSeek V4.1 Flash | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Expert | 1505 | 1484 |
| GPQA Diamond | — | 94.4% |
| Humanity's Last Exam | — | 46.4% |
| SimpleQA Verified | — | 73.5% |
| Vectara Hallucination Rate | — | 10.4% |

## Multimodal

- DeepSeek V4.1 Flash: —
- Gemini 3.1 Pro Preview: 38.1 (#60)

| Benchmark | DeepSeek V4.1 Flash | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Vision | — | 1296 |
| Blueprint-Bench 2 | — | 26.5% |
| Furniture Assembly | — | 26.7% |
| LMArena Document | — | 1444 |

## Multilingual

- DeepSeek V4.1 Flash: 55.5 (#29)
- Gemini 3.1 Pro Preview: 57.1 (#11)

| Benchmark | DeepSeek V4.1 Flash | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Non-English | 1452 | 1475 |
| LMArena Chinese | 1506 | 1528 |
| LMArena French | 1448 | 1488 |
| LMArena Russian | 1473 | 1496 |
| LMArena Spanish | 1499 | 1480 |
| LMArena German | — | 1491 |
| LMArena Japanese | — | 1494 |
| LMArena Korean | — | 1458 |

## Instruction Following

- DeepSeek V4.1 Flash: 77.6 (#24)
- Gemini 3.1 Pro Preview: 77.1 (#31)

| Benchmark | DeepSeek V4.1 Flash | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Instruction Following | 1475 | 1465 |

## Long Context

- DeepSeek V4.1 Flash: 45.2 (#46)
- Gemini 3.1 Pro Preview: 47.3 (#17)

| Benchmark | DeepSeek V4.1 Flash | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Longer Query | 1476 | 1482 |
| CL-bench | — | 20.8% |
| CL-bench Life | — | 16.9% |

## Writing & Preference

- DeepSeek V4.1 Flash: 65.8 (#43)
- Gemini 3.1 Pro Preview: 66.3 (#36)

| Benchmark | DeepSeek V4.1 Flash | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Text | 1465 | 1480 |
| LMArena Creative Writing | 1436 | 1482 |
| EQ-Bench Creative Writing | 1540 | 1491 |
| LMArena Multi-Turn | 1460 | 1486 |
| EQ-Bench 4 | — | 1142 |

## FAQ

### Is DeepSeek V4.1 Flash better than Gemini 3.1 Pro Preview?

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 50.3 on the Noometry Index. DeepSeek V4.1 Flash costs 17× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

### Which is cheaper, DeepSeek V4.1 Flash or Gemini 3.1 Pro Preview?

DeepSeek V4.1 Flash is cheaper. It lists at $0.15 per million input tokens and $0.60 per million output tokens; Gemini 3.1 Pro Preview lists at $2 and $12.

### Is DeepSeek V4.1 Flash or Gemini 3.1 Pro Preview better for coding?

DeepSeek V4.1 Flash scores higher on coding benchmarks: 52.8 versus 42.7 in the Noometry coding category.

### Which has the bigger context window?

Gemini 3.1 Pro Preview does, with 1.05M tokens against 1M.

### How many benchmarks do DeepSeek V4.1 Flash and Gemini 3.1 Pro Preview share?

24 benchmarks have published results for both models. DeepSeek V4.1 Flash has 25 scored results on Noometry and Gemini 3.1 Pro Preview has 71.