# Claude 3 Opus vs DeepSeek V4.1 Flash

> DeepSeek V4.1 Flash is the stronger model overall, scoring 50.3 to 29.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-opus-vs-deepseek-v4-1-flash
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Claude 3 Opus scores higher in 0 categories and DeepSeek V4.1 Flash in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where DeepSeek V4.1 Flash leads 48.4 to 13.9.
- The biggest single-benchmark swing is LMCA: 17% for Claude 3 Opus and 47% for DeepSeek V4.1 Flash.
- DeepSeek V4.1 Flash has downloadable open weights; the other is API-only.

## Snapshot

| | Claude 3 Opus | DeepSeek V4.1 Flash |
|---|---|---|
| Provider | Anthropic | DeepSeek |
| Noometry Index | 29.3 | 50.3 |
| Rank | 300 | 40 |
| Context | — | 1M |
| Input $/M | — | $0.15 |
| Output $/M | — | $0.60 |
| Weights | Proprietary | Open |

## Coding

- Claude 3 Opus: 32.4 (#261)
- DeepSeek V4.1 Flash: 52.8 (#29)

| Benchmark | Claude 3 Opus | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Coding | 1264 | 1511 |
| LMArena WebDev | — | 1620 |
| SciCode | — | 51.9% |
| WeirdML | 19.2% | — |
| BigCodeBench Instruct | 45.5% | — |
| LiveBench Coding | 38.6% | — |
| BigCodeBench Complete | 57.4% | — |
| ALE-Bench | — | 1,092 |
| HumanEval+ | 77.4% | — |
| MBPP+ | 73.3% | — |

## Agentic & Tool Use

- Claude 3 Opus: 24.3 (#110)
- DeepSeek V4.1 Flash: —

| Benchmark | Claude 3 Opus | DeepSeek V4.1 Flash |
|---|---|---|
| Cybench | 10% | — |
| METR Time Horizons | 29.5% | — |

## Reasoning

- Claude 3 Opus: 14.2 (#318)
- DeepSeek V4.1 Flash: 46.2 (#39)

| Benchmark | Claude 3 Opus | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Hard Prompts | 1246 | 1485 |
| DTBench | 61.6% | 89.9% |
| LMCA | 17% | 47% |
| Epoch Capabilities Index | 126.91 | 155.01 |
| SimpleBench | 23.5% | — |
| NYT Connections (extended) | — | 89.6% |
| CritPt | — | 14.3% |
| Chess Puzzles | 5% | — |
| EnigmaEval | 0.8% | — |
| LiveBench Reasoning | 40.6% | — |
| LiveBench Data Analysis | 57.9% | — |
| Surface Evolver Bench | — | 46.3% |
| ForecastBench | 58.4 | — |
| LiveBench | 49.2% | — |
| WinoGrande | 88.5% | — |

## Math

- Claude 3 Opus: 13.9 (#293)
- DeepSeek V4.1 Flash: 48.4 (#52)

| Benchmark | Claude 3 Opus | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Math | 1273 | 1493 |
| OTIS Mock AIME 2024-2025 | 4.7% | — |
| ProofBench | — | 54% |
| LiveBench Math | 43.6% | — |
| MATH Level 5 | 37.5% | — |

## Knowledge

- Claude 3 Opus: 24.5 (#262)
- DeepSeek V4.1 Flash: 41.6 (#97)

| Benchmark | Claude 3 Opus | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Expert | 1223 | 1505 |
| GPQA Diamond | 47.2% | — |
| SimpleQA Verified | 12.6% | — |
| Confabulations | 22.7% | — |
| MMLU | 84.6% | — |

## Multimodal

- Claude 3 Opus: 26.6 (#112)
- DeepSeek V4.1 Flash: —

| Benchmark | Claude 3 Opus | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Vision | 1023 | — |

## Multilingual

- Claude 3 Opus: 41.6 (#202)
- DeepSeek V4.1 Flash: 55.5 (#29)

| Benchmark | Claude 3 Opus | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Non-English | 1258 | 1452 |
| LMArena Chinese | 1248 | 1506 |
| LMArena French | 1274 | 1448 |
| LMArena Russian | 1280 | 1473 |
| LMArena Spanish | 1246 | 1499 |
| LMArena German | 1258 | — |
| LMArena Japanese | 1204 | — |
| LMArena Korean | 1187 | — |

## Instruction Following

- Claude 3 Opus: 64.3 (#223)
- DeepSeek V4.1 Flash: 77.6 (#24)

| Benchmark | Claude 3 Opus | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Instruction Following | 1248 | 1475 |
| LiveBench Instruction Following | 63.9% | — |

## Long Context

- Claude 3 Opus: 38.2 (#197)
- DeepSeek V4.1 Flash: 45.2 (#46)

| Benchmark | Claude 3 Opus | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Longer Query | 1259 | 1476 |

## Writing & Preference

- Claude 3 Opus: 47.4 (#208)
- DeepSeek V4.1 Flash: 65.8 (#43)

| Benchmark | Claude 3 Opus | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Text | 1262 | 1465 |
| LMArena Creative Writing | 1235 | 1436 |
| LMArena Multi-Turn | 1275 | 1460 |
| EQ-Bench Creative Writing | — | 1540 |
| LiveBench Language | 50.4% | — |

## FAQ

### Is Claude 3 Opus better than DeepSeek V4.1 Flash?

DeepSeek V4.1 Flash is the stronger model overall, scoring 50.3 to 29.3 on the Noometry Index.

### Is Claude 3 Opus or DeepSeek V4.1 Flash better for coding?

DeepSeek V4.1 Flash scores higher on coding benchmarks: 52.8 versus 32.4 in the Noometry coding category.

### How many benchmarks do Claude 3 Opus and DeepSeek V4.1 Flash share?

17 benchmarks have published results for both models. Claude 3 Opus has 46 scored results on Noometry and DeepSeek V4.1 Flash has 25.