# gpt-oss-20b vs Grok-3 mini

> Grok-3 mini is the stronger model overall, scoring 41.0 to 32.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-oss-20b-vs-grok-3-mini
- Last updated: 2026-10-10
- Shared benchmarks: 26

## Summary

- They share 26 benchmarks with published results for both. gpt-oss-20b scores higher in 1 category and Grok-3 mini in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Grok-3 mini leads 52.7 to 35.8.
- The biggest single-benchmark swing is Omni-MATH: 56.5% for gpt-oss-20b and 31.8% for Grok-3 mini.
- gpt-oss-20b has downloadable open weights; the other is API-only.

## Snapshot

| | gpt-oss-20b | Grok-3 mini |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 32.1 | 41.0 |
| Rank | 249 | 130 |
| Context | 131K | — |
| Input $/M | $0.018 | — |
| Output $/M | $0.09 | — |
| Weights | Open | Proprietary |

## Coding

- gpt-oss-20b: 37.1 (#185)
- Grok-3 mini: 40.4 (#126)

| Benchmark | gpt-oss-20b | Grok-3 mini |
|---|---|---|
| WeirdML | 40.9% | 42.6% |
| LMArena Coding | 1307 | 1380 |
| Aider Polyglot | — | 49.3% |
| SciCode | 34.4% | — |
| ALE-Bench | 566.05 | — |

## Agentic & Tool Use

- gpt-oss-20b: 9.2 (#146)
- Grok-3 mini: —

| Benchmark | gpt-oss-20b | Grok-3 mini |
|---|---|---|
| Terminal-Bench | 3.4% | — |

## Reasoning

- gpt-oss-20b: 18.8 (#251)
- Grok-3 mini: 13.8 (#323)

| Benchmark | gpt-oss-20b | Grok-3 mini |
|---|---|---|
| Kagi LLM Benchmark | 53.2% | 61.3% |
| LMArena Hard Prompts | 1274 | 1374 |
| Epoch Capabilities Index | 137.81 | 140.35 |
| ARC-AGI-2 | — | 0.4% |
| ARC-AGI-1 | — | 16.5% |
| CritPt | 1.4% | — |
| Chess Puzzles | 4% | — |
| DTBench | 68% | — |
| LMCA | 14.5% | — |

## Math

- gpt-oss-20b: 37.6 (#93)
- Grok-3 mini: 40.3 (#78)

| Benchmark | gpt-oss-20b | Grok-3 mini |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 65.3% | 77.8% |
| Omni-MATH | 56.5% | 31.8% |
| LMArena Math | 1317 | 1386 |
| MATH Level 5 | — | 90.9% |
| FrontierMath (Feb 2025 set) | — | 5.9% |

## Knowledge

- gpt-oss-20b: 34.6 (#186)
- Grok-3 mini: 46.3 (#75)

| Benchmark | gpt-oss-20b | Grok-3 mini |
|---|---|---|
| GPQA Diamond | 60.8% | 76.3% |
| MMLU-Pro | 74% | 79.9% |
| GPQA (HELM) | 59.4% | 67.5% |
| LMArena Expert | 1258 | 1395 |
| Confabulations | — | 10.8% |

## Multilingual

- gpt-oss-20b: 42.4 (#192)
- Grok-3 mini: 48.3 (#141)

| Benchmark | gpt-oss-20b | Grok-3 mini |
|---|---|---|
| LMArena Non-English | 1269 | 1352 |
| LMArena Chinese | 1311 | 1387 |
| LMArena German | 1249 | 1350 |
| LMArena Japanese | 1245 | 1343 |
| LMArena Korean | 1239 | 1336 |
| LMArena Russian | 1279 | 1352 |
| LMArena Spanish | 1267 | 1379 |
| LMArena French | — | 1357 |

## Instruction Following

- gpt-oss-20b: 62.0 (#235)
- Grok-3 mini: 78.7 (#8)

| Benchmark | gpt-oss-20b | Grok-3 mini |
|---|---|---|
| IFEval | 73.2% | 95.1% |
| LMArena Instruction Following | 1236 | 1356 |

## Long Context

- gpt-oss-20b: 37.9 (#203)
- Grok-3 mini: 41.0 (#142)

| Benchmark | gpt-oss-20b | Grok-3 mini |
|---|---|---|
| LMArena Longer Query | 1251 | 1372 |
| Fiction.LiveBench | — | 66.7% |

## Writing & Preference

- gpt-oss-20b: 35.8 (#260)
- Grok-3 mini: 52.7 (#163)

| Benchmark | gpt-oss-20b | Grok-3 mini |
|---|---|---|
| LMArena Text | 1288 | 1370 |
| LMArena Creative Writing | 1201 | 1342 |
| WildBench | 73.7% | 65.1% |
| LMArena Multi-Turn | 1268 | 1355 |
| Short-Story Creative Writing | — | 73.5% |
| EQ-Bench Creative Writing | 666 | — |

## FAQ

### Is gpt-oss-20b better than Grok-3 mini?

Grok-3 mini is the stronger model overall, scoring 41.0 to 32.1 on the Noometry Index.

### Is gpt-oss-20b or Grok-3 mini better for coding?

Grok-3 mini scores higher on coding benchmarks: 40.4 versus 37.1 in the Noometry coding category.

### How many benchmarks do gpt-oss-20b and Grok-3 mini share?

26 benchmarks have published results for both models. gpt-oss-20b has 34 scored results on Noometry and Grok-3 mini has 35.