# Grok 4.1 Fast vs Olmo 3.1 32b Think

> Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 37.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-1-fast-vs-olmo-3-1-32b-think
- Last updated: 2026-10-10
- Shared benchmarks: 15

## Summary

- They share 15 benchmarks with published results for both. Grok 4.1 Fast scores higher in 5 categories and Olmo 3.1 32b Think 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 25.2.
- Olmo 3.1 32b Think has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.1 Fast | Olmo 3.1 32b Think |
|---|---|---|
| Provider | xAI | Allen Institute for AI (Ai2) |
| Noometry Index | 41.4 | 37.9 |
| Rank | 136 | 191 |
| 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 Think: 37.7 (#189)

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Coding | 1411 | 1291 |
| LMArena WebDev | 1242 | — |
| ALE-Bench | 394.93 | — |

## Agentic & Tool Use

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

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Think |
|---|---|---|
| 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 Think: 25.2 (#150)

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Hard Prompts | 1407 | 1272 |
| SimpleBench | 56% | — |
| NYT Connections (extended) | 87.4% | — |
| DTBench | 87.7% | — |
| ForecastBench | 61 | — |

## Math

- Grok 4.1 Fast: 31.9 (#221)
- Olmo 3.1 32b Think: 36.3 (#168)

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

## Knowledge

- Grok 4.1 Fast: 33.1 (#207)
- Olmo 3.1 32b Think: 35.7 (#181)

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Expert | 1399 | 1295 |
| Vectara Hallucination Rate | 17.8% | — |

## Multimodal

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

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

## Multilingual

- Grok 4.1 Fast: 51.0 (#114)
- Olmo 3.1 32b Think: 38.1 (#231)

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Non-English | 1391 | 1209 |
| LMArena Chinese | 1441 | 1242 |
| LMArena French | 1415 | 1260 |
| LMArena German | 1404 | 1262 |
| LMArena Russian | 1387 | 1193 |
| LMArena Spanish | 1413 | 1289 |
| LMArena Japanese | 1349 | — |
| LMArena Korean | 1361 | — |

## Instruction Following

- Grok 4.1 Fast: 72.7 (#133)
- Olmo 3.1 32b Think: 65.6 (#218)

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Instruction Following | 1376 | 1247 |

## Long Context

- Grok 4.1 Fast: 42.4 (#126)
- Olmo 3.1 32b Think: 38.6 (#195)

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Longer Query | 1390 | 1272 |

## Writing & Preference

- Grok 4.1 Fast: 57.2 (#131)
- Olmo 3.1 32b Think: 46.2 (#220)

| Benchmark | Grok 4.1 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Text | 1408 | 1272 |
| LMArena Creative Writing | 1394 | 1226 |
| LMArena Multi-Turn | 1389 | 1252 |
| EQ-Bench Creative Writing | 1327 | — |

## FAQ

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

Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 37.9 on the Noometry Index.

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

Olmo 3.1 32b Think scores higher on coding benchmarks: 37.7 versus 34.1 in the Noometry coding category.

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

15 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Olmo 3.1 32b Think has 15.