# DeepSeek V4.1 Flash vs DeepSeek V4 Pro

> DeepSeek V4 Pro is the stronger model overall, scoring 54.3 to 52.8 on the Noometry Index. DeepSeek V4.1 Flash costs 3.8× less per token, which makes it the better buy when DeepSeek V4 Pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/deepseek-v4-1-flash-vs-deepseek-v4-pro
- Last updated: 2026-10-10
- Shared benchmarks: 34

## Summary

- They share 34 benchmarks with published results for both. DeepSeek V4.1 Flash scores higher in 5 categories and DeepSeek V4 Pro in 4 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where DeepSeek V4 Pro leads 56.5 to 50.2.
- The biggest single-benchmark swing is APEX-Agents: 39.5% for DeepSeek V4.1 Flash and 47.3% for DeepSeek V4 Pro.
- DeepSeek V4.1 Flash is cheaper at $0.15 / $0.60 per million input/output tokens, against $0.66 / $1.98 for DeepSeek V4 Pro.

## Snapshot

| | DeepSeek V4.1 Flash | DeepSeek V4 Pro |
|---|---|---|
| Provider | DeepSeek | DeepSeek |
| Noometry Index | 52.8 | 54.3 |
| Rank | 38 | 31 |
| Context | 1M | 1M |
| Input $/M | $0.15 | $0.66 |
| Output $/M | $0.60 | $1.98 |
| Weights | Open | Open |

## Coding

- DeepSeek V4.1 Flash: 52.9 (#32)
- DeepSeek V4 Pro: 52.4 (#34)

| Benchmark | DeepSeek V4.1 Flash | DeepSeek V4 Pro |
|---|---|---|
| LMArena WebDev | 1619 | 1582 |
| SciCode | 51.9% | 51% |
| LMArena Coding | 1506 | 1470 |
| ALE-Bench | 1,092 | 1,403 |
| SWE-bench Verified | — | 77.6% |
| FrontierCode | — | 28.6% |
| WeirdML | — | 66.2% |

## Agentic & Tool Use

- DeepSeek V4.1 Flash: 31.2 (#69)
- DeepSeek V4 Pro: 32.8 (#58)

| Benchmark | DeepSeek V4.1 Flash | DeepSeek V4 Pro |
|---|---|---|
| APEX-Agents | 39.5% | 47.3% |
| GDP.pdf | 19.8% | — |
| Vending-Bench 2 | — | 3,285 |

## Reasoning

- DeepSeek V4.1 Flash: 50.2 (#36)
- DeepSeek V4 Pro: 56.5 (#24)

| Benchmark | DeepSeek V4.1 Flash | DeepSeek V4 Pro |
|---|---|---|
| NYT Connections (extended) | 89.6% | 91.3% |
| CritPt | 14.3% | 18% |
| LMArena Hard Prompts | 1483 | 1461 |
| Mystery Game Puzzles | 43% | 43% |
| DTBench | 89.9% | 93.9% |
| LMCA | 47% | 45.5% |
| Surface Evolver Bench | 46.3% | 40% |
| Epoch Capabilities Index | 154.9 | 155.31 |
| ARC-AGI-2 | — | 61.3% |
| Kagi LLM Benchmark | — | 53.5% |
| ARC-AGI-1 | — | 90.5% |
| Chess Puzzles | — | 47% |
| ForecastBench | — | 56.1 |

## Math

- DeepSeek V4.1 Flash: 66.7 (#25)
- DeepSeek V4 Pro: 64.8 (#30)

| Benchmark | DeepSeek V4.1 Flash | DeepSeek V4 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 67.4% | 64.6% |
| FrontierMath Tier 4 | 26.8% | 26.8% |
| OTIS Mock AIME 2024-2025 | 98.3% | 98.6% |
| ProofBench | 54% | 50% |
| LMArena Math | 1477 | 1455 |
| MathArena Final-Answer Competitions | — | 76.6% |

## Knowledge

- DeepSeek V4.1 Flash: 57.9 (#38)
- DeepSeek V4 Pro: 59.5 (#31)

| Benchmark | DeepSeek V4.1 Flash | DeepSeek V4 Pro |
|---|---|---|
| GPQA Diamond | 89.8% | 91.7% |
| LMArena Expert | 1506 | 1464 |
| SimpleQA Verified | — | 52.9% |
| Vectara Hallucination Rate | — | 8.6% |

## Multimodal

- DeepSeek V4.1 Flash: 39.1 (#61)
- DeepSeek V4 Pro: —

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

## Multilingual

- DeepSeek V4.1 Flash: 55.0 (#35)
- DeepSeek V4 Pro: 54.4 (#45)

| Benchmark | DeepSeek V4.1 Flash | DeepSeek V4 Pro |
|---|---|---|
| LMArena Non-English | 1448 | 1439 |
| LMArena Chinese | 1497 | 1486 |
| LMArena French | 1452 | 1472 |
| LMArena German | 1484 | 1458 |
| LMArena Japanese | 1412 | 1445 |
| LMArena Korean | 1452 | 1447 |
| LMArena Russian | 1471 | 1453 |
| LMArena Spanish | 1459 | 1458 |

## Instruction Following

- DeepSeek V4.1 Flash: 77.3 (#26)
- DeepSeek V4 Pro: 76.1 (#47)

| Benchmark | DeepSeek V4.1 Flash | DeepSeek V4 Pro |
|---|---|---|
| LMArena Instruction Following | 1474 | 1448 |

## Long Context

- DeepSeek V4.1 Flash: 45.2 (#47)
- DeepSeek V4 Pro: 45.0 (#51)

| Benchmark | DeepSeek V4.1 Flash | DeepSeek V4 Pro |
|---|---|---|
| LMArena Longer Query | 1475 | 1458 |
| CL-bench Life | — | 13.5% |

## Writing & Preference

- DeepSeek V4.1 Flash: 65.4 (#48)
- DeepSeek V4 Pro: 65.5 (#46)

| Benchmark | DeepSeek V4.1 Flash | DeepSeek V4 Pro |
|---|---|---|
| LMArena Text | 1462 | 1451 |
| LMArena Creative Writing | 1435 | 1446 |
| EQ-Bench Creative Writing | 1540 | 1553 |
| LMArena Multi-Turn | 1457 | 1467 |
| EQ-Bench 4 | — | 1166 |

## FAQ

### Is DeepSeek V4.1 Flash better than DeepSeek V4 Pro?

DeepSeek V4 Pro is the stronger model overall, scoring 54.3 to 52.8 on the Noometry Index. DeepSeek V4.1 Flash costs 3.8× less per token, which makes it the better buy when DeepSeek V4 Pro's lead doesn't matter for your workload.

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

DeepSeek V4.1 Flash is cheaper. It lists at $0.15 per million input tokens and $0.60 per million output tokens; DeepSeek V4 Pro lists at $0.66 and $1.98.

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

They score almost the same on coding (52.9 vs 52.4); test both on your own repository before choosing.

### Which has the bigger context window?

Both accept 1M tokens.

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

34 benchmarks have published results for both models. DeepSeek V4.1 Flash has 37 scored results on Noometry and DeepSeek V4 Pro has 48.