# Grok 4.1 Fast vs Olmo 3.1 32b Instruct

> Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 39.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-1-fast-vs-olmo-3-1-32b-instruct
- Last updated: 2026-10-12
- Shared benchmarks: 16

## Summary

- They share 16 benchmarks with published results for both. Grok 4.1 Fast scores higher in 5 categories and Olmo 3.1 32b Instruct in 3 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 26.4.
- Olmo 3.1 32b Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.1 Fast | Olmo 3.1 32b Instruct |
|---|---|---|
| Provider | xAI | Allen Institute for AI (Ai2) |
| Noometry Index | 41.4 | 39.4 |
| Rank | 136 | 168 |
| Context | 128K | — |
| Input $/M | $0.20 | — |
| Output $/M | $0.50 | — |
| Weights | Proprietary | Open |

## Coding

- Grok 4.1 Fast: 34.1 (#245)
- Olmo 3.1 32b Instruct: 39.5 (#157)

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Coding | 1411 | 1347 |
| LMArena WebDev | 1242 | — |
| ALE-Bench | 394.93 | — |

## Agentic & Tool Use

- Grok 4.1 Fast: 36.3 (#39)
- Olmo 3.1 32b Instruct: —

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Instruct |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |

## Reasoning

- Grok 4.1 Fast: 43.4 (#49)
- Olmo 3.1 32b Instruct: 26.4 (#132)

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Hard Prompts | 1407 | 1322 |
| SimpleBench | 56% | — |
| NYT Connections (extended) | 87.4% | — |
| DTBench | 87.7% | — |
| ForecastBench | 61 | — |

## Math

- Grok 4.1 Fast: 31.9 (#221)
- Olmo 3.1 32b Instruct: 36.3 (#167)

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Math | 1408 | 1305 |
| MathArena Final-Answer Competitions | 60.9% | — |
| ProofBench | 4% | — |

## Knowledge

- Grok 4.1 Fast: 33.1 (#207)
- Olmo 3.1 32b Instruct: 36.1 (#175)

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Expert | 1399 | 1308 |
| Vectara Hallucination Rate | 17.8% | — |

## Multimodal

- Grok 4.1 Fast: 37.0 (#76)
- Olmo 3.1 32b Instruct: —

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Vision | 1201 | — |

## Multilingual

- Grok 4.1 Fast: 51.0 (#114)
- Olmo 3.1 32b Instruct: 42.6 (#191)

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Non-English | 1391 | 1275 |
| LMArena Chinese | 1441 | 1304 |
| LMArena French | 1415 | 1328 |
| LMArena German | 1404 | 1282 |
| LMArena Korean | 1361 | 1206 |
| LMArena Russian | 1387 | 1268 |
| LMArena Spanish | 1413 | 1336 |
| LMArena Japanese | 1349 | — |

## Instruction Following

- Grok 4.1 Fast: 72.7 (#133)
- Olmo 3.1 32b Instruct: 68.6 (#187)

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Instruction Following | 1376 | 1299 |

## Long Context

- Grok 4.1 Fast: 42.4 (#126)
- Olmo 3.1 32b Instruct: 39.9 (#166)

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Longer Query | 1390 | 1312 |

## Writing & Preference

- Grok 4.1 Fast: 57.2 (#131)
- Olmo 3.1 32b Instruct: 50.2 (#185)

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Text | 1408 | 1311 |
| LMArena Creative Writing | 1394 | 1264 |
| LMArena Multi-Turn | 1389 | 1309 |
| EQ-Bench Creative Writing | 1327 | — |

## FAQ

### Is Grok 4.1 Fast better than Olmo 3.1 32b Instruct?

Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 39.4 on the Noometry Index.

### Is Grok 4.1 Fast or Olmo 3.1 32b Instruct better for coding?

Olmo 3.1 32b Instruct scores higher on coding benchmarks: 39.5 versus 34.1 in the Noometry coding category.

### How many benchmarks do Grok 4.1 Fast and Olmo 3.1 32b Instruct share?

16 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Olmo 3.1 32b Instruct has 16.