# Grok-3 mini vs Grok 4.1 Fast

> Grok-3 mini and Grok 4.1 Fast score almost the same on the Noometry Index (41.2 vs 41.4), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/grok-3-mini-vs-grok-4-1-fast
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Grok-3 mini scores higher in 4 categories and Grok 4.1 Fast in 4 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 13.6.

## Snapshot

| | Grok-3 mini | Grok 4.1 Fast |
|---|---|---|
| Provider | xAI | xAI |
| Noometry Index | 41.2 | 41.4 |
| Rank | 141 | 136 |
| Context | — | 128K |
| Input $/M | — | $0.20 |
| Output $/M | — | $0.50 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok-3 mini: 40.8 (#131)
- Grok 4.1 Fast: 34.1 (#245)

| Benchmark | Grok-3 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Coding | 1379 | 1411 |
| Aider Polyglot | 49.3% | — |
| LMArena WebDev | — | 1242 |
| WeirdML | 42.6% | — |
| ALE-Bench | — | 394.93 |

## Agentic & Tool Use

- Grok-3 mini: —
- Grok 4.1 Fast: 36.3 (#39)

| Benchmark | Grok-3 mini | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 69.6% |
| τ²-bench Banking | — | 13.1% |
| LMArena Search | — | 1171 |
| Vending-Bench 2 | — | 1,107 |

## Reasoning

- Grok-3 mini: 13.6 (#334)
- Grok 4.1 Fast: 43.4 (#49)

| Benchmark | Grok-3 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Hard Prompts | 1375 | 1407 |
| ARC-AGI-2 | 0.4% | — |
| SimpleBench | — | 56% |
| Kagi LLM Benchmark | 61.3% | — |
| NYT Connections (extended) | — | 87.4% |
| ARC-AGI-1 | 16.5% | — |
| DTBench | — | 87.7% |
| Epoch Capabilities Index | 140.35 | — |
| ForecastBench | — | 61 |

## Math

- Grok-3 mini: 42.1 (#85)
- Grok 4.1 Fast: 31.9 (#221)

| Benchmark | Grok-3 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1386 | 1408 |
| MathArena Final-Answer Competitions | — | 60.9% |
| OTIS Mock AIME 2024-2025 | 77.8% | — |
| ProofBench | — | 4% |
| Omni-MATH | 31.8% | — |
| MATH Level 5 | 90.9% | — |
| FrontierMath (Feb 2025 set) | 5.9% | — |

## Knowledge

- Grok-3 mini: 46.4 (#81)
- Grok 4.1 Fast: 33.1 (#207)

| Benchmark | Grok-3 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Expert | 1395 | 1399 |
| GPQA Diamond | 76.3% | — |
| MMLU-Pro | 79.9% | — |
| Confabulations | 10.8% | — |
| Vectara Hallucination Rate | — | 17.8% |
| GPQA (HELM) | 67.5% | — |

## Multimodal

- Grok-3 mini: —
- Grok 4.1 Fast: 37.0 (#76)

| Benchmark | Grok-3 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | — | 1201 |

## Multilingual

- Grok-3 mini: 48.1 (#145)
- Grok 4.1 Fast: 51.0 (#114)

| Benchmark | Grok-3 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1352 | 1391 |
| LMArena Chinese | 1387 | 1441 |
| LMArena French | 1357 | 1415 |
| LMArena German | 1349 | 1404 |
| LMArena Japanese | 1342 | 1349 |
| LMArena Korean | 1335 | 1361 |
| LMArena Russian | 1353 | 1387 |
| LMArena Spanish | 1381 | 1413 |

## Instruction Following

- Grok-3 mini: 78.5 (#9)
- Grok 4.1 Fast: 72.7 (#133)

| Benchmark | Grok-3 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1357 | 1376 |
| IFEval | 95.1% | — |

## Long Context

- Grok-3 mini: 41.0 (#147)
- Grok 4.1 Fast: 42.4 (#126)

| Benchmark | Grok-3 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1372 | 1390 |
| Fiction.LiveBench | 66.7% | — |

## Writing & Preference

- Grok-3 mini: 52.5 (#169)
- Grok 4.1 Fast: 57.2 (#131)

| Benchmark | Grok-3 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1370 | 1408 |
| LMArena Creative Writing | 1342 | 1394 |
| LMArena Multi-Turn | 1355 | 1389 |
| Short-Story Creative Writing | 73.5% | — |
| EQ-Bench Creative Writing | — | 1327 |
| WildBench | 65.1% | — |

## FAQ

### Is Grok-3 mini better than Grok 4.1 Fast?

Grok-3 mini and Grok 4.1 Fast score almost the same on the Noometry Index (41.2 vs 41.4), so choose on price, context window or the category you care about most.

### Is Grok-3 mini or Grok 4.1 Fast better for coding?

Grok-3 mini scores higher on coding benchmarks: 40.8 versus 34.1 in the Noometry coding category.

### How many benchmarks do Grok-3 mini and Grok 4.1 Fast share?

17 benchmarks have published results for both models. Grok-3 mini has 35 scored results on Noometry and Grok 4.1 Fast has 32.