# DeepSeek V4.1 Flash vs Grok 4 Fast

> DeepSeek V4.1 Flash is the stronger model overall, scoring 50.3 to 39.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/deepseek-v4-1-flash-vs-grok-4-fast
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. DeepSeek V4.1 Flash scores higher in 7 categories and Grok 4 Fast in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where DeepSeek V4.1 Flash leads 46.2 to 22.5.
- The biggest single-benchmark swing is DTBench: 89.9% for DeepSeek V4.1 Flash and 82.7% for Grok 4 Fast.
- DeepSeek V4.1 Flash has downloadable open weights; the other is API-only.

## Snapshot

| | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| Provider | DeepSeek | xAI |
| Noometry Index | 50.3 | 39.0 |
| Rank | 40 | 164 |
| Context | 1M | — |
| Input $/M | $0.15 | — |
| Output $/M | $0.60 | — |
| Weights | Open | Proprietary |

## Coding

- DeepSeek V4.1 Flash: 52.8 (#29)
- Grok 4 Fast: 32.3 (#264)

| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena WebDev | 1620 | 1160 |
| LMArena Coding | 1511 | 1429 |
| SciCode | 51.9% | — |
| WeirdML | — | 42.9% |
| ALE-Bench | 1,092 | — |

## Agentic & Tool Use

- DeepSeek V4.1 Flash: —
- Grok 4 Fast: 29.3 (#80)

| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |

## Reasoning

- DeepSeek V4.1 Flash: 46.2 (#39)
- Grok 4 Fast: 22.5 (#179)

| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Hard Prompts | 1485 | 1413 |
| DTBench | 89.9% | 82.7% |
| Epoch Capabilities Index | 155.01 | 144.21 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| NYT Connections (extended) | 89.6% | — |
| ARC-AGI-1 | — | 48.5% |
| CritPt | 14.3% | — |
| LMCA | 47% | — |
| Surface Evolver Bench | 46.3% | — |
| ForecastBench | — | 60.5 |

## Math

- DeepSeek V4.1 Flash: 48.4 (#52)
- Grok 4 Fast: 36.1 (#126)

| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1493 | 1419 |
| ProofBench | 54% | — |

## Knowledge

- DeepSeek V4.1 Flash: 41.6 (#97)
- Grok 4 Fast: 31.5 (#211)

| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1505 | 1411 |
| Vectara Hallucination Rate | — | 19.7% |

## Multilingual

- DeepSeek V4.1 Flash: 55.5 (#29)
- Grok 4 Fast: 51.5 (#106)

| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1452 | 1397 |
| LMArena Chinese | 1506 | 1458 |
| LMArena French | 1448 | 1433 |
| LMArena Russian | 1473 | 1387 |
| LMArena Spanish | 1499 | 1414 |
| LMArena German | — | 1383 |
| LMArena Japanese | — | 1358 |
| LMArena Korean | — | 1359 |

## Instruction Following

- DeepSeek V4.1 Flash: 77.6 (#24)
- Grok 4 Fast: 73.4 (#116)

| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1475 | 1388 |

## Long Context

- DeepSeek V4.1 Flash: 45.2 (#46)
- Grok 4 Fast: 63.2 (#3)

| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1476 | 1415 |
| Fiction.LiveBench | — | 94.4% |

## Writing & Preference

- DeepSeek V4.1 Flash: 65.8 (#43)
- Grok 4 Fast: 60.2 (#96)

| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1465 | 1407 |
| LMArena Creative Writing | 1436 | 1388 |
| LMArena Multi-Turn | 1460 | 1414 |
| EQ-Bench Creative Writing | 1540 | — |

## FAQ

### Is DeepSeek V4.1 Flash better than Grok 4 Fast?

DeepSeek V4.1 Flash is the stronger model overall, scoring 50.3 to 39.0 on the Noometry Index.

### Is DeepSeek V4.1 Flash or Grok 4 Fast better for coding?

DeepSeek V4.1 Flash scores higher on coding benchmarks: 52.8 versus 32.3 in the Noometry coding category.

### How many benchmarks do DeepSeek V4.1 Flash and Grok 4 Fast share?

17 benchmarks have published results for both models. DeepSeek V4.1 Flash has 25 scored results on Noometry and Grok 4 Fast has 30.