Model comparison
DeepSeek V4.1 Flash vs Grok 4 Fast
DeepSeek V4.1 Flash is the stronger model overall, scoring 52.8 to 39.4 on the Noometry Index.
Last verified . 20 shared benchmarks.
DeepSeekSummary
- They share 20 benchmarks with published results for both. DeepSeek V4.1 Flash scores higher in 8 categories and Grok 4 Fast in 1 category; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where DeepSeek V4.1 Flash leads 50.2 to 22.2.
- 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.
Side by side
| DeepSeek V4.1 Flash | Grok 4 Fast | |
|---|---|---|
| Provider | DeepSeek | xAI |
| Noometry Index | 52.8 | 39.4 |
| Released | 2026-09-09 | 2025-09-19 |
| Weights | Open | Proprietary |
| Context window | 1M | — |
| Max output | 393K | — |
| Input $ / M tokens | $0.15 | — |
| Output $ / M tokens | $0.60 | — |
| Results tracked | 37 | 30 |
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Category by category
Coding DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 52.9 (#32), Grok 4 Fast: 32.5 (#271)
| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena WebDev | 1619 | 1159 |
| LMArena Coding | 1506 | 1429 |
| SciCode | 51.9% | — |
| WeirdML | — | 42.9% |
| ALE-Bench | 1,092 | — |
Agentic & Tool Use DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 31.2 (#69), Grok 4 Fast: 29.5 (#86)
| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| APEX-Agents | 39.5% | — |
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| GDP.pdf | 19.8% | — |
| LMArena Search | — | 1171 |
Reasoning DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 50.2 (#36), Grok 4 Fast: 22.2 (#201)
| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Hard Prompts | 1483 | 1412 |
| DTBench | 89.9% | 82.7% |
| Epoch Capabilities Index | 154.9 | 144.2 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| NYT Connections (extended) | 89.6% | — |
| ARC-AGI-1 | — | 48.5% |
| CritPt | 14.3% | — |
| Mystery Game Puzzles | 43% | — |
| LMCA | 47% | — |
| Surface Evolver Bench | 46.3% | — |
| ForecastBench | — | 60.5 |
Math DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 66.7 (#25), Grok 4 Fast: 38.9 (#123)
| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1477 | 1419 |
| FrontierMath (Tiers 1-3) | 67.4% | — |
| FrontierMath Tier 4 | 26.8% | — |
| OTIS Mock AIME 2024-2025 | 98.3% | — |
| ProofBench | 54% | — |
Knowledge DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 57.9 (#38), Grok 4 Fast: 32.0 (#214)
| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1506 | 1411 |
| GPQA Diamond | 89.8% | — |
| Vectara Hallucination Rate | — | 19.7% |
Multimodal Not comparable
DeepSeek V4.1 Flash: 39.1 (#61), Grok 4 Fast: —
| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Vision | 1277 | — |
| Furniture Assembly | 34.2% | — |
Multilingual DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 55.0 (#35), Grok 4 Fast: 51.3 (#111)
| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1448 | 1396 |
| LMArena Chinese | 1497 | 1457 |
| LMArena French | 1452 | 1431 |
| LMArena German | 1484 | 1383 |
| LMArena Japanese | 1412 | 1352 |
| LMArena Korean | 1452 | 1357 |
| LMArena Russian | 1471 | 1389 |
| LMArena Spanish | 1459 | 1415 |
Instruction Following DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 77.3 (#26), Grok 4 Fast: 73.2 (#121)
| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1474 | 1387 |
Long Context Grok 4 Fast leads
DeepSeek V4.1 Flash: 45.2 (#47), Grok 4 Fast: 63.2 (#3)
| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1475 | 1415 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 65.4 (#48), Grok 4 Fast: 60.0 (#102)
| Benchmark | DeepSeek V4.1 Flash | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1462 | 1407 |
| LMArena Creative Writing | 1435 | 1387 |
| LMArena Multi-Turn | 1457 | 1414 |
| EQ-Bench Creative Writing | 1540 | — |
Frequently asked questions
Is DeepSeek V4.1 Flash better than Grok 4 Fast?
DeepSeek V4.1 Flash is the stronger model overall, scoring 52.8 to 39.4 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: 52.9 versus 32.5 in the Noometry coding category.
How many benchmarks do DeepSeek V4.1 Flash and Grok 4 Fast share?
20 benchmarks have published results for both models. DeepSeek V4.1 Flash has 37 scored results on Noometry and Grok 4 Fast has 30.