# DeepSeek V4.1 Flash vs Grok 4.5

> Grok 4.5 is the stronger model overall, scoring 55.0 to 50.3 on the Noometry Index. DeepSeek V4.1 Flash costs 11× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/deepseek-v4-1-flash-vs-grok-4-5
- Last updated: 2026-10-10
- Shared benchmarks: 25

## Summary

- They share 25 benchmarks with published results for both. DeepSeek V4.1 Flash scores higher in 4 categories and Grok 4.5 in 4 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Grok 4.5 leads 62.3 to 41.6.
- The biggest single-benchmark swing is Surface Evolver Bench: 46.3% for DeepSeek V4.1 Flash and 74.4% for Grok 4.5.
- DeepSeek V4.1 Flash is cheaper at $0.15 / $0.60 per million input/output tokens, against $2 / $6 for Grok 4.5.
- DeepSeek V4.1 Flash accepts more context: 1M tokens versus 500K.
- DeepSeek V4.1 Flash has downloadable open weights; the other is API-only.

## Snapshot

| | DeepSeek V4.1 Flash | Grok 4.5 |
|---|---|---|
| Provider | DeepSeek | xAI |
| Noometry Index | 50.3 | 55.0 |
| Rank | 40 | 22 |
| Context | 1M | 500K |
| Input $/M | $0.15 | $2 |
| Output $/M | $0.60 | $6 |
| Weights | Open | Proprietary |

## Coding

- DeepSeek V4.1 Flash: 52.8 (#29)
- Grok 4.5: 51.7 (#34)

| Benchmark | DeepSeek V4.1 Flash | Grok 4.5 |
|---|---|---|
| LMArena WebDev | 1620 | 1552 |
| SciCode | 51.9% | 54.1% |
| LMArena Coding | 1511 | 1473 |
| ALE-Bench | 1,092 | 1,309 |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.4% |
| WeirdML | — | 46.4% |

## Agentic & Tool Use

- DeepSeek V4.1 Flash: —
- Grok 4.5: 44.4 (#15)

| Benchmark | DeepSeek V4.1 Flash | Grok 4.5 |
|---|---|---|
| APEX-Agents | — | 56.2% |
| τ²-bench Banking | — | 47.9% |
| PostTrainBench | — | 23.4% |
| GBAEval | — | 65.4% |
| GDP.pdf | — | 14% |
| LMArena Search | — | 1213 |
| Vending-Bench 2 | — | 3,887 |

## Reasoning

- DeepSeek V4.1 Flash: 46.2 (#39)
- Grok 4.5: 56.0 (#23)

| Benchmark | DeepSeek V4.1 Flash | Grok 4.5 |
|---|---|---|
| NYT Connections (extended) | 89.6% | 79.9% |
| CritPt | 14.3% | 15.4% |
| LMArena Hard Prompts | 1485 | 1462 |
| DTBench | 89.9% | 96.5% |
| LMCA | 47% | 45.2% |
| Surface Evolver Bench | 46.3% | 74.4% |
| Epoch Capabilities Index | 155.01 | 154.02 |
| ARC-AGI-2 | — | 52.6% |
| SimpleBench | — | 70% |
| Kagi LLM Benchmark | — | 83.5% |
| ARC-AGI-1 | — | 87.2% |
| Chess Puzzles | — | 36% |

## Math

- DeepSeek V4.1 Flash: 48.4 (#52)
- Grok 4.5: 60.7 (#29)

| Benchmark | DeepSeek V4.1 Flash | Grok 4.5 |
|---|---|---|
| ProofBench | 54% | 31% |
| LMArena Math | 1493 | 1457 |
| FrontierMath (Tiers 1-3) | — | 57.2% |
| FrontierMath Tier 4 | — | 24.4% |
| OTIS Mock AIME 2024-2025 | — | 97.8% |

## Knowledge

- DeepSeek V4.1 Flash: 41.6 (#97)
- Grok 4.5: 62.3 (#21)

| Benchmark | DeepSeek V4.1 Flash | Grok 4.5 |
|---|---|---|
| LMArena Expert | 1505 | 1466 |
| GPQA Diamond | — | 93.4% |
| SimpleQA Verified | — | 48.3% |

## Multimodal

- DeepSeek V4.1 Flash: —
- Grok 4.5: 37.8 (#63)

| Benchmark | DeepSeek V4.1 Flash | Grok 4.5 |
|---|---|---|
| LMArena Vision | — | 1287 |
| Blueprint-Bench 2 | — | 27.3% |
| Furniture Assembly | — | 22.5% |
| LMArena Document | — | 1452 |

## Multilingual

- DeepSeek V4.1 Flash: 55.5 (#29)
- Grok 4.5: 54.5 (#43)

| Benchmark | DeepSeek V4.1 Flash | Grok 4.5 |
|---|---|---|
| LMArena Non-English | 1452 | 1439 |
| LMArena Chinese | 1506 | 1497 |
| LMArena French | 1448 | 1458 |
| LMArena Russian | 1473 | 1447 |
| LMArena Spanish | 1499 | 1452 |
| LMArena German | — | 1448 |
| LMArena Japanese | — | 1425 |
| LMArena Korean | — | 1402 |

## Instruction Following

- DeepSeek V4.1 Flash: 77.6 (#24)
- Grok 4.5: 76.3 (#45)

| Benchmark | DeepSeek V4.1 Flash | Grok 4.5 |
|---|---|---|
| LMArena Instruction Following | 1475 | 1446 |

## Long Context

- DeepSeek V4.1 Flash: 45.2 (#46)
- Grok 4.5: 44.8 (#54)

| Benchmark | DeepSeek V4.1 Flash | Grok 4.5 |
|---|---|---|
| LMArena Longer Query | 1476 | 1463 |

## Writing & Preference

- DeepSeek V4.1 Flash: 65.8 (#43)
- Grok 4.5: 65.9 (#40)

| Benchmark | DeepSeek V4.1 Flash | Grok 4.5 |
|---|---|---|
| LMArena Text | 1465 | 1448 |
| LMArena Creative Writing | 1436 | 1442 |
| EQ-Bench Creative Writing | 1540 | 1579 |
| LMArena Multi-Turn | 1460 | 1457 |

## FAQ

### Is DeepSeek V4.1 Flash better than Grok 4.5?

Grok 4.5 is the stronger model overall, scoring 55.0 to 50.3 on the Noometry Index. DeepSeek V4.1 Flash costs 11× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.

### Which is cheaper, DeepSeek V4.1 Flash or Grok 4.5?

DeepSeek V4.1 Flash is cheaper. It lists at $0.15 per million input tokens and $0.60 per million output tokens; Grok 4.5 lists at $2 and $6.

### Is DeepSeek V4.1 Flash or Grok 4.5 better for coding?

DeepSeek V4.1 Flash scores higher on coding benchmarks: 52.8 versus 51.7 in the Noometry coding category.

### Which has the bigger context window?

DeepSeek V4.1 Flash does, with 1M tokens against 500K.

### How many benchmarks do DeepSeek V4.1 Flash and Grok 4.5 share?

25 benchmarks have published results for both models. DeepSeek V4.1 Flash has 25 scored results on Noometry and Grok 4.5 has 52.