# DeepSeek V4.1 Flash vs Nemotron 3.5 Lightning

> DeepSeek V4.1 Flash is the stronger model overall, scoring 52.8 to 40.0 on the Noometry Index. Nemotron 3.5 Lightning costs 3.0× less per token, which makes it the better buy when DeepSeek V4.1 Flash's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/deepseek-v4-1-flash-vs-nemotron-3-5-lightning
- Last updated: 2026-10-12
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. DeepSeek V4.1 Flash scores higher in 8 categories and Nemotron 3.5 Lightning in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where DeepSeek V4.1 Flash leads 66.7 to 37.5.
- Nemotron 3.5 Lightning is cheaper at $0.05 / $0.20 per million input/output tokens, against $0.15 / $0.60 for DeepSeek V4.1 Flash.
- DeepSeek V4.1 Flash accepts more context: 1M tokens versus 262K.

## Snapshot

| | DeepSeek V4.1 Flash | Nemotron 3.5 Lightning |
|---|---|---|
| Provider | DeepSeek | NVIDIA |
| Noometry Index | 52.8 | 40.0 |
| Rank | 38 | 155 |
| Context | 1M | 262K |
| Input $/M | $0.15 | $0.05 |
| Output $/M | $0.60 | $0.20 |
| Weights | Open | Open |

## Coding

- DeepSeek V4.1 Flash: 52.9 (#32)
- Nemotron 3.5 Lightning: 40.4 (#141)

| Benchmark | DeepSeek V4.1 Flash | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Coding | 1506 | 1375 |
| LMArena WebDev | 1619 | — |
| SciCode | 51.9% | — |
| ALE-Bench | 1,092 | — |

## Agentic & Tool Use

- DeepSeek V4.1 Flash: 31.2 (#69)
- Nemotron 3.5 Lightning: —

| Benchmark | DeepSeek V4.1 Flash | Nemotron 3.5 Lightning |
|---|---|---|
| APEX-Agents | 39.5% | — |
| GDP.pdf | 19.8% | — |

## Reasoning

- DeepSeek V4.1 Flash: 50.2 (#36)
- Nemotron 3.5 Lightning: 26.8 (#127)

| Benchmark | DeepSeek V4.1 Flash | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Hard Prompts | 1483 | 1337 |
| NYT Connections (extended) | 89.6% | — |
| CritPt | 14.3% | — |
| Mystery Game Puzzles | 43% | — |
| DTBench | 89.9% | — |
| LMCA | 47% | — |
| Surface Evolver Bench | 46.3% | — |
| Epoch Capabilities Index | 154.9 | — |

## Math

- DeepSeek V4.1 Flash: 66.7 (#25)
- Nemotron 3.5 Lightning: 37.5 (#155)

| Benchmark | DeepSeek V4.1 Flash | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Math | 1477 | 1359 |
| FrontierMath (Tiers 1-3) | 67.4% | — |
| FrontierMath Tier 4 | 26.8% | — |
| OTIS Mock AIME 2024-2025 | 98.3% | — |
| ProofBench | 54% | — |

## Knowledge

- DeepSeek V4.1 Flash: 57.9 (#38)
- Nemotron 3.5 Lightning: 37.5 (#154)

| Benchmark | DeepSeek V4.1 Flash | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Expert | 1506 | 1356 |
| GPQA Diamond | 89.8% | — |

## Multimodal

- DeepSeek V4.1 Flash: 39.1 (#61)
- Nemotron 3.5 Lightning: —

| Benchmark | DeepSeek V4.1 Flash | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Vision | 1277 | — |
| Furniture Assembly | 34.2% | — |

## Multilingual

- DeepSeek V4.1 Flash: 55.0 (#35)
- Nemotron 3.5 Lightning: 44.0 (#180)

| Benchmark | DeepSeek V4.1 Flash | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Non-English | 1448 | 1295 |
| LMArena Chinese | 1497 | 1359 |
| LMArena French | 1452 | 1366 |
| LMArena German | 1484 | 1282 |
| LMArena Japanese | 1412 | 1206 |
| LMArena Korean | 1452 | 1238 |
| LMArena Russian | 1471 | 1253 |
| LMArena Spanish | 1459 | 1345 |

## Instruction Following

- DeepSeek V4.1 Flash: 77.3 (#26)
- Nemotron 3.5 Lightning: 69.6 (#170)

| Benchmark | DeepSeek V4.1 Flash | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Instruction Following | 1474 | 1318 |

## Long Context

- DeepSeek V4.1 Flash: 45.2 (#47)
- Nemotron 3.5 Lightning: 39.9 (#165)

| Benchmark | DeepSeek V4.1 Flash | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Longer Query | 1475 | 1314 |

## Writing & Preference

- DeepSeek V4.1 Flash: 65.4 (#48)
- Nemotron 3.5 Lightning: 48.5 (#201)

| Benchmark | DeepSeek V4.1 Flash | Nemotron 3.5 Lightning |
|---|---|---|
| LMArena Text | 1462 | 1327 |
| LMArena Creative Writing | 1435 | 1254 |
| EQ-Bench Creative Writing | 1540 | 1280 |
| LMArena Multi-Turn | 1457 | 1328 |

## FAQ

### Is DeepSeek V4.1 Flash better than Nemotron 3.5 Lightning?

DeepSeek V4.1 Flash is the stronger model overall, scoring 52.8 to 40.0 on the Noometry Index. Nemotron 3.5 Lightning costs 3.0× less per token, which makes it the better buy when DeepSeek V4.1 Flash's lead doesn't matter for your workload.

### Which is cheaper, DeepSeek V4.1 Flash or Nemotron 3.5 Lightning?

Nemotron 3.5 Lightning is cheaper. It lists at $0.05 per million input tokens and $0.20 per million output tokens; DeepSeek V4.1 Flash lists at $0.15 and $0.60.

### Is DeepSeek V4.1 Flash or Nemotron 3.5 Lightning better for coding?

DeepSeek V4.1 Flash scores higher on coding benchmarks: 52.9 versus 40.4 in the Noometry coding category.

### Which has the bigger context window?

DeepSeek V4.1 Flash does, with 1M tokens against 262K.

### How many benchmarks do DeepSeek V4.1 Flash and Nemotron 3.5 Lightning share?

18 benchmarks have published results for both models. DeepSeek V4.1 Flash has 37 scored results on Noometry and Nemotron 3.5 Lightning has 18.