# Grok 4 Fast vs Olmo 3.1 32b Think

> Grok 4 Fast is the stronger model overall, scoring 39.4 to 37.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-fast-vs-olmo-3-1-32b-think
- Last updated: 2026-10-12
- Shared benchmarks: 15

## Summary

- They share 15 benchmarks with published results for both. Grok 4 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 long context, where Grok 4 Fast leads 63.2 to 38.6.
- Olmo 3.1 32b Think has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| Provider | xAI | Allen Institute for AI (Ai2) |
| Noometry Index | 39.4 | 37.9 |
| Rank | 167 | 191 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Open |

## Coding

- Grok 4 Fast: 32.5 (#271)
- Olmo 3.1 32b Think: 37.7 (#189)

| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Coding | 1429 | 1291 |
| LMArena WebDev | 1159 | — |
| WeirdML | 42.9% | — |

## Agentic & Tool Use

- Grok 4 Fast: 29.5 (#86)
- Olmo 3.1 32b Think: —

| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |

## Reasoning

- Grok 4 Fast: 22.2 (#201)
- Olmo 3.1 32b Think: 25.2 (#150)

| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Hard Prompts | 1412 | 1272 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| DTBench | 82.7% | — |
| Epoch Capabilities Index | 144.2 | — |
| ForecastBench | 60.5 | — |

## Math

- Grok 4 Fast: 38.9 (#123)
- Olmo 3.1 32b Think: 36.3 (#168)

| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Math | 1419 | 1305 |

## Knowledge

- Grok 4 Fast: 32.0 (#214)
- Olmo 3.1 32b Think: 35.7 (#181)

| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Expert | 1411 | 1295 |
| Vectara Hallucination Rate | 19.7% | — |

## Multilingual

- Grok 4 Fast: 51.3 (#111)
- Olmo 3.1 32b Think: 38.1 (#231)

| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Non-English | 1396 | 1209 |
| LMArena Chinese | 1457 | 1242 |
| LMArena French | 1431 | 1260 |
| LMArena German | 1383 | 1262 |
| LMArena Russian | 1389 | 1193 |
| LMArena Spanish | 1415 | 1289 |
| LMArena Japanese | 1352 | — |
| LMArena Korean | 1357 | — |

## Instruction Following

- Grok 4 Fast: 73.2 (#121)
- Olmo 3.1 32b Think: 65.6 (#218)

| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Instruction Following | 1387 | 1247 |

## Long Context

- Grok 4 Fast: 63.2 (#3)
- Olmo 3.1 32b Think: 38.6 (#195)

| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Longer Query | 1415 | 1272 |
| Fiction.LiveBench | 94.4% | — |

## Writing & Preference

- Grok 4 Fast: 60.0 (#102)
- Olmo 3.1 32b Think: 46.2 (#220)

| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Text | 1407 | 1272 |
| LMArena Creative Writing | 1387 | 1226 |
| LMArena Multi-Turn | 1414 | 1252 |

## FAQ

### Is Grok 4 Fast better than Olmo 3.1 32b Think?

Grok 4 Fast is the stronger model overall, scoring 39.4 to 37.9 on the Noometry Index.

### Is Grok 4 Fast or Olmo 3.1 32b Think better for coding?

Olmo 3.1 32b Think scores higher on coding benchmarks: 37.7 versus 32.5 in the Noometry coding category.

### How many benchmarks do Grok 4 Fast and Olmo 3.1 32b Think share?

15 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Olmo 3.1 32b Think has 15.