# gpt-oss-20b vs Grok 3

> Grok 3 is the stronger model overall, scoring 39.9 to 32.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-oss-20b-vs-grok-3
- Last updated: 2026-10-10
- Shared benchmarks: 27

## Summary

- They share 27 benchmarks with published results for both. gpt-oss-20b scores higher in 2 categories and Grok 3 in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where Grok 3 leads 30.5 to 9.3.
- The biggest single-benchmark swing is IFEval: 73.2% for gpt-oss-20b and 88.4% for Grok 3.
- gpt-oss-20b has downloadable open weights; the other is API-only.

## Snapshot

| | gpt-oss-20b | Grok 3 |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 32.5 | 39.9 |
| Rank | 255 | 157 |
| Context | 131K | — |
| Input $/M | $0.018 | — |
| Output $/M | $0.09 | — |
| Weights | Open | Proprietary |

## Coding

- gpt-oss-20b: 37.6 (#192)
- Grok 3: 41.9 (#115)

| Benchmark | gpt-oss-20b | Grok 3 |
|---|---|---|
| WeirdML | 40.9% | 37.2% |
| LMArena Coding | 1306 | 1432 |
| Aider Polyglot | — | 53.3% |
| SciCode | 34.4% | — |
| ALE-Bench | 566.05 | — |

## Agentic & Tool Use

- gpt-oss-20b: 9.3 (#154)
- Grok 3: 30.5 (#76)

| Benchmark | gpt-oss-20b | Grok 3 |
|---|---|---|
| Terminal-Bench | 3.4% | — |
| BALROG | — | 29.5% |

## Reasoning

- gpt-oss-20b: 19.3 (#261)
- Grok 3: 13.7 (#333)

| Benchmark | gpt-oss-20b | Grok 3 |
|---|---|---|
| Kagi LLM Benchmark | 53.2% | 61.3% |
| LMArena Hard Prompts | 1274 | 1434 |
| Epoch Capabilities Index | 137.82 | 138.33 |
| ARC-AGI-2 | — | 0% |
| SimpleBench | — | 36.1% |
| ARC-AGI-1 | — | 5.5% |
| CritPt | 1.4% | — |
| Chess Puzzles | 4% | — |
| DTBench | 68% | — |
| LMCA | 14.5% | — |

## Math

- gpt-oss-20b: 39.4 (#103)
- Grok 3: 38.0 (#145)

| Benchmark | gpt-oss-20b | Grok 3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 65.3% | 55.6% |
| Omni-MATH | 56.5% | 46.4% |
| LMArena Math | 1317 | 1391 |
| MATH Level 5 | — | 88.7% |
| FrontierMath (Feb 2025 set) | — | 3.8% |
| FrontierMath Tier 4 (v1) | — | 0% |

## Knowledge

- gpt-oss-20b: 34.6 (#195)
- Grok 3: 46.2 (#82)

| Benchmark | gpt-oss-20b | Grok 3 |
|---|---|---|
| GPQA Diamond | 60.8% | 75.8% |
| MMLU-Pro | 74% | 78.8% |
| GPQA (HELM) | 59.4% | 65% |
| LMArena Expert | 1258 | 1421 |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 5.8% |

## Multilingual

- gpt-oss-20b: 42.2 (#197)
- Grok 3: 52.3 (#87)

| Benchmark | gpt-oss-20b | Grok 3 |
|---|---|---|
| LMArena Non-English | 1268 | 1410 |
| LMArena Chinese | 1314 | 1448 |
| LMArena German | 1255 | 1431 |
| LMArena Japanese | 1244 | 1387 |
| LMArena Korean | 1236 | 1373 |
| LMArena Russian | 1278 | 1416 |
| LMArena Spanish | 1267 | 1417 |
| LMArena French | — | 1460 |

## Instruction Following

- gpt-oss-20b: 61.8 (#240)
- Grok 3: 75.0 (#73)

| Benchmark | gpt-oss-20b | Grok 3 |
|---|---|---|
| IFEval | 73.2% | 88.4% |
| LMArena Instruction Following | 1236 | 1409 |

## Long Context

- gpt-oss-20b: 37.9 (#209)
- Grok 3: 38.7 (#192)

| Benchmark | gpt-oss-20b | Grok 3 |
|---|---|---|
| LMArena Longer Query | 1250 | 1439 |
| Fiction.LiveBench | — | 58.3% |

## Writing & Preference

- gpt-oss-20b: 35.5 (#265)
- Grok 3: 55.8 (#141)

| Benchmark | gpt-oss-20b | Grok 3 |
|---|---|---|
| LMArena Text | 1287 | 1426 |
| LMArena Creative Writing | 1201 | 1414 |
| EQ-Bench Creative Writing | 666 | 1186 |
| WildBench | 73.7% | 84.9% |
| LMArena Multi-Turn | 1268 | 1425 |
| Short-Story Creative Writing | — | 76.4% |

## FAQ

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

Grok 3 is the stronger model overall, scoring 39.9 to 32.5 on the Noometry Index.

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

Grok 3 scores higher on coding benchmarks: 41.9 versus 37.6 in the Noometry coding category.

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

27 benchmarks have published results for both models. gpt-oss-20b has 34 scored results on Noometry and Grok 3 has 40.