# Grok 4.1 Fast vs o1

> Grok 4.1 Fast and o1 score almost the same on the Noometry Index (41.4 vs 40.9), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/grok-4-1-fast-vs-o1
- Last updated: 2026-10-11
- Shared benchmarks: 20

## Summary

- They share 20 benchmarks with published results for both. Grok 4.1 Fast scores higher in 5 categories and o1 in 5 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 27.9.
- The biggest single-benchmark swing is SimpleBench: 56% for Grok 4.1 Fast and 41.7% for o1.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $15 / $60 for o1.
- o1 accepts more context: 200K tokens versus 128K.

## Snapshot

| | Grok 4.1 Fast | o1 |
|---|---|---|
| Provider | xAI | OpenAI |
| Noometry Index | 41.4 | 40.9 |
| Rank | 136 | 143 |
| Context | 128K | 200K |
| Input $/M | $0.20 | $15 |
| Output $/M | $0.50 | $60 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4.1 Fast: 34.1 (#245)
- o1: 46.1 (#70)

| Benchmark | Grok 4.1 Fast | o1 |
|---|---|---|
| LMArena Coding | 1411 | 1367 |
| Aider Polyglot | — | 61.7% |
| LMArena WebDev | 1242 | — |
| WeirdML | — | 47.6% |
| LiveBench Coding | — | 69.7% |
| CadEval | — | 56% |
| ALE-Bench | 394.93 | — |
| HumanEval+ | — | 89% |
| MBPP+ | — | 80.2% |

## Agentic & Tool Use

- Grok 4.1 Fast: 36.3 (#39)
- o1: 24.6 (#117)

| Benchmark | Grok 4.1 Fast | o1 |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| Cybench | — | 10% |
| LMArena Search | 1171 | — |
| METR Time Horizons | — | 51.1% |
| Vending-Bench 2 | 1,107 | — |

## Reasoning

- Grok 4.1 Fast: 43.4 (#49)
- o1: 27.9 (#111)

| Benchmark | Grok 4.1 Fast | o1 |
|---|---|---|
| SimpleBench | 56% | 41.7% |
| LMArena Hard Prompts | 1407 | 1371 |
| DTBench | 87.7% | 74.7% |
| NYT Connections (extended) | 87.4% | — |
| ARC-AGI-1 | — | 30.7% |
| Chess Puzzles | — | 15% |
| EnigmaEval | — | 5.7% |
| LiveBench Reasoning | — | 91.6% |
| LiveBench Data Analysis | — | 65.5% |
| LMCA | — | 22.3% |
| Epoch Capabilities Index | — | 141.91 |
| ForecastBench | 61 | — |
| LiveBench | — | 75.7% |

## Math

- Grok 4.1 Fast: 31.9 (#221)
- o1: 36.1 (#175)

| Benchmark | Grok 4.1 Fast | o1 |
|---|---|---|
| LMArena Math | 1408 | 1388 |
| FrontierMath (Tiers 1-3) | — | 14.7% |
| MathArena Final-Answer Competitions | 60.9% | — |
| OTIS Mock AIME 2024-2025 | — | 73.3% |
| ProofBench | 4% | — |
| LiveBench Math | — | 80.3% |
| MATH Level 5 | — | 94.7% |
| FrontierMath (Feb 2025 set) | — | 9.3% |

## Knowledge

- Grok 4.1 Fast: 33.1 (#207)
- o1: 41.5 (#110)

| Benchmark | Grok 4.1 Fast | o1 |
|---|---|---|
| LMArena Expert | 1399 | 1361 |
| GPQA Diamond | — | 76.8% |
| Humanity's Last Exam | — | 8% |
| SimpleQA Verified | — | 41.1% |
| Confabulations | — | 11.7% |
| Vectara Hallucination Rate | 17.8% | — |

## Multimodal

- Grok 4.1 Fast: 37.0 (#76)
- o1: 34.2 (#93)

| Benchmark | Grok 4.1 Fast | o1 |
|---|---|---|
| LMArena Vision | 1201 | 1168 |
| GeoBench | — | 80% |
| VPCT | — | 37% |
| SpatialViz-Bench | — | 41.4% |

## Multilingual

- Grok 4.1 Fast: 51.0 (#114)
- o1: 48.6 (#142)

| Benchmark | Grok 4.1 Fast | o1 |
|---|---|---|
| LMArena Non-English | 1391 | 1358 |
| LMArena Chinese | 1441 | 1394 |
| LMArena French | 1415 | 1344 |
| LMArena German | 1404 | 1337 |
| LMArena Japanese | 1349 | 1346 |
| LMArena Korean | 1361 | 1396 |
| LMArena Russian | 1387 | 1356 |
| LMArena Spanish | 1413 | 1345 |

## Instruction Following

- Grok 4.1 Fast: 72.7 (#133)
- o1: 74.8 (#86)

| Benchmark | Grok 4.1 Fast | o1 |
|---|---|---|
| LMArena Instruction Following | 1376 | 1367 |
| LiveBench Instruction Following | — | 81.5% |

## Long Context

- Grok 4.1 Fast: 42.4 (#126)
- o1: 50.3 (#9)

| Benchmark | Grok 4.1 Fast | o1 |
|---|---|---|
| LMArena Longer Query | 1390 | 1378 |
| Fiction.LiveBench | — | 83.3% |

## Writing & Preference

- Grok 4.1 Fast: 57.2 (#131)
- o1: 55.6 (#144)

| Benchmark | Grok 4.1 Fast | o1 |
|---|---|---|
| LMArena Text | 1408 | 1366 |
| LMArena Creative Writing | 1394 | 1348 |
| LMArena Multi-Turn | 1389 | 1369 |
| Short-Story Creative Writing | — | 70.2% |
| EQ-Bench Creative Writing | 1327 | — |
| LiveBench Language | — | 65.4% |

## FAQ

### Is Grok 4.1 Fast better than o1?

Grok 4.1 Fast and o1 score almost the same on the Noometry Index (41.4 vs 40.9), so choose on price, context window or the category you care about most.

### Which is cheaper, Grok 4.1 Fast or o1?

Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; o1 lists at $15 and $60.

### Is Grok 4.1 Fast or o1 better for coding?

o1 scores higher on coding benchmarks: 46.1 versus 34.1 in the Noometry coding category.

### Which has the bigger context window?

o1 does, with 200K tokens against 128K.

### How many benchmarks do Grok 4.1 Fast and o1 share?

20 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and o1 has 52.