# DeepSeek V4 Flash vs Grok 4 Fast

> DeepSeek V4 Flash is the stronger model overall, scoring 53.6 to 39.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/deepseek-v4-flash-vs-grok-4-fast
- Last updated: 2026-10-10
- Shared benchmarks: 24

## Summary

- They share 24 benchmarks with published results for both. DeepSeek V4 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 Flash leads 53.7 to 22.5.
- The biggest single-benchmark swing is ARC-AGI-2: 61.4% for DeepSeek V4 Flash and 5.3% for Grok 4 Fast.
- DeepSeek V4 Flash has downloadable open weights; the other is API-only.

## Snapshot

| | DeepSeek V4 Flash | Grok 4 Fast |
|---|---|---|
| Provider | DeepSeek | xAI |
| Noometry Index | 53.6 | 39.0 |
| Rank | 32 | 164 |
| Context | 1M | — |
| Input $/M | $0.15 | — |
| Output $/M | $0.60 | — |
| Weights | Open | Proprietary |

## Coding

- DeepSeek V4 Flash: 47.6 (#56)
- Grok 4 Fast: 32.3 (#264)

| Benchmark | DeepSeek V4 Flash | Grok 4 Fast |
|---|---|---|
| LMArena WebDev | 1581 | 1160 |
| WeirdML | 63% | 42.9% |
| LMArena Coding | 1457 | 1429 |
| FrontierCode | 18.8% | — |
| SciCode | 49.9% | — |
| ALE-Bench | 1,306 | — |

## Agentic & Tool Use

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

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

## Reasoning

- DeepSeek V4 Flash: 53.7 (#25)
- Grok 4 Fast: 22.5 (#179)

| Benchmark | DeepSeek V4 Flash | Grok 4 Fast |
|---|---|---|
| ARC-AGI-2 | 61.4% | 5.3% |
| Kagi LLM Benchmark | 52.2% | 66.1% |
| ARC-AGI-1 | 89% | 48.5% |
| LMArena Hard Prompts | 1443 | 1413 |
| DTBench | 90.9% | 82.7% |
| Epoch Capabilities Index | 154.51 | 144.21 |
| SimpleBench | 61.1% | — |
| NYT Connections (extended) | 89.6% | — |
| CritPt | 16.6% | — |
| Chess Puzzles | 33% | — |
| Mystery Game Puzzles | 34% | — |
| LMCA | 41.7% | — |
| ForecastBench | — | 60.5 |

## Math

- DeepSeek V4 Flash: 60.0 (#31)
- Grok 4 Fast: 36.1 (#126)

| Benchmark | DeepSeek V4 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1427 | 1419 |
| FrontierMath (Tiers 1-3) | 57.5% | — |
| FrontierMath Tier 4 | 24.4% | — |
| MathArena Final-Answer Competitions | 76.5% | — |
| OTIS Mock AIME 2024-2025 | 94.4% | — |
| ProofBench | 56% | — |

## Knowledge

- DeepSeek V4 Flash: 55.5 (#43)
- Grok 4 Fast: 31.5 (#211)

| Benchmark | DeepSeek V4 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1441 | 1411 |
| GPQA Diamond | 91% | — |
| SimpleQA Verified | 33.6% | — |
| Vectara Hallucination Rate | — | 19.7% |

## Multilingual

- DeepSeek V4 Flash: 53.2 (#71)
- Grok 4 Fast: 51.5 (#106)

| Benchmark | DeepSeek V4 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1420 | 1397 |
| LMArena Chinese | 1467 | 1458 |
| LMArena French | 1438 | 1433 |
| LMArena German | 1418 | 1383 |
| LMArena Japanese | 1403 | 1358 |
| LMArena Korean | 1383 | 1359 |
| LMArena Russian | 1428 | 1387 |
| LMArena Spanish | 1437 | 1414 |

## Instruction Following

- DeepSeek V4 Flash: 75.1 (#76)
- Grok 4 Fast: 73.4 (#116)

| Benchmark | DeepSeek V4 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1421 | 1388 |

## Long Context

- DeepSeek V4 Flash: 43.8 (#81)
- Grok 4 Fast: 63.2 (#3)

| Benchmark | DeepSeek V4 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1435 | 1415 |
| Fiction.LiveBench | — | 94.4% |

## Writing & Preference

- DeepSeek V4 Flash: 64.0 (#59)
- Grok 4 Fast: 60.2 (#96)

| Benchmark | DeepSeek V4 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1432 | 1407 |
| LMArena Creative Writing | 1403 | 1388 |
| LMArena Multi-Turn | 1449 | 1414 |
| EQ-Bench Creative Writing | 1559 | — |

## FAQ

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

DeepSeek V4 Flash is the stronger model overall, scoring 53.6 to 39.0 on the Noometry Index.

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

DeepSeek V4 Flash scores higher on coding benchmarks: 47.6 versus 32.3 in the Noometry coding category.

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

24 benchmarks have published results for both models. DeepSeek V4 Flash has 41 scored results on Noometry and Grok 4 Fast has 30.