# DeepSeek-V2.5 (Sep 2024) vs Grok 4 Fast

> Grok 4 Fast is the stronger model overall, scoring 39.0 to 37.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/deepseek-v2-5-vs-grok-4-fast
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. DeepSeek-V2.5 (Sep 2024) scores higher in 2 categories and Grok 4 Fast in 6 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 39.5.
- DeepSeek-V2.5 (Sep 2024) has downloadable open weights; the other is API-only.

## Snapshot

| | DeepSeek-V2.5 (Sep 2024) | Grok 4 Fast |
|---|---|---|
| Provider | DeepSeek | xAI |
| Noometry Index | 37.0 | 39.0 |
| Rank | 197 | 164 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Open | Proprietary |

## Coding

- DeepSeek-V2.5 (Sep 2024): 31.3 (#274)
- Grok 4 Fast: 32.3 (#264)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Coding | 1310 | 1429 |
| Aider Polyglot | 17.8% | — |
| LMArena WebDev | — | 1160 |
| WeirdML | — | 42.9% |
| BigCodeBench Instruct | 48.6% | — |
| BigCodeBench Complete | 53.2% | — |
| HumanEval+ | 83.5% | — |
| MBPP+ | 74.1% | — |

## Agentic & Tool Use

- DeepSeek-V2.5 (Sep 2024): —
- Grok 4 Fast: 29.3 (#80)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |

## Reasoning

- DeepSeek-V2.5 (Sep 2024): 24.5 (#145)
- Grok 4 Fast: 22.5 (#179)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Hard Prompts | 1289 | 1413 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| ARC-AGI-1 | — | 48.5% |
| DTBench | — | 82.7% |
| Epoch Capabilities Index | — | 144.21 |
| ForecastBench | — | 60.5 |

## Math

- DeepSeek-V2.5 (Sep 2024): 33.3 (#177)
- Grok 4 Fast: 36.1 (#126)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1289 | 1419 |

## Knowledge

- DeepSeek-V2.5 (Sep 2024): 34.2 (#190)
- Grok 4 Fast: 31.5 (#211)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1266 | 1411 |
| Vectara Hallucination Rate | — | 19.7% |

## Multilingual

- DeepSeek-V2.5 (Sep 2024): 42.7 (#188)
- Grok 4 Fast: 51.5 (#106)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1273 | 1397 |
| LMArena Chinese | 1317 | 1458 |
| LMArena French | 1288 | 1433 |
| LMArena German | 1258 | 1383 |
| LMArena Japanese | 1228 | 1358 |
| LMArena Korean | 1209 | 1359 |
| LMArena Russian | 1289 | 1387 |
| LMArena Spanish | 1248 | 1414 |

## Instruction Following

- DeepSeek-V2.5 (Sep 2024): 67.7 (#189)
- Grok 4 Fast: 73.4 (#116)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1280 | 1388 |

## Long Context

- DeepSeek-V2.5 (Sep 2024): 39.5 (#169)
- Grok 4 Fast: 63.2 (#3)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1301 | 1415 |
| Fiction.LiveBench | — | 94.4% |

## Writing & Preference

- DeepSeek-V2.5 (Sep 2024): 50.0 (#182)
- Grok 4 Fast: 60.2 (#96)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1294 | 1407 |
| LMArena Creative Writing | 1285 | 1388 |
| LMArena Multi-Turn | 1297 | 1414 |

## FAQ

### Is DeepSeek-V2.5 (Sep 2024) better than Grok 4 Fast?

Grok 4 Fast is the stronger model overall, scoring 39.0 to 37.0 on the Noometry Index.

### Is DeepSeek-V2.5 (Sep 2024) or Grok 4 Fast better for coding?

They score almost the same on coding (31.3 vs 32.3); test both on your own repository before choosing.

### How many benchmarks do DeepSeek-V2.5 (Sep 2024) and Grok 4 Fast share?

17 benchmarks have published results for both models. DeepSeek-V2.5 (Sep 2024) has 22 scored results on Noometry and Grok 4 Fast has 30.