# gpt-oss-20b vs Kimi K2 Thinking Turbo

> Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 32.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-oss-20b-vs-kimi-k2-thinking-turbo
- Last updated: 2026-10-10
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. gpt-oss-20b scores higher in 0 categories and Kimi K2 Thinking Turbo in 8 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Kimi K2 Thinking Turbo leads 60.0 to 35.5.
- The biggest single-benchmark swing is GPQA Diamond: 60.8% for gpt-oss-20b and 84.2% for Kimi K2 Thinking Turbo.

## Snapshot

| | gpt-oss-20b | Kimi K2 Thinking Turbo |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 32.5 | 45.8 |
| Rank | 255 | 70 |
| Context | 131K | — |
| Input $/M | $0.018 | — |
| Output $/M | $0.09 | — |
| Weights | Open | Open |

## Coding

- gpt-oss-20b: 37.6 (#192)
- Kimi K2 Thinking Turbo: 38.4 (#178)

| Benchmark | gpt-oss-20b | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Coding | 1306 | 1454 |
| LMArena WebDev | — | 1322 |
| SciCode | 34.4% | — |
| WeirdML | 40.9% | — |
| ALE-Bench | 566.05 | — |

## Agentic & Tool Use

- gpt-oss-20b: 9.3 (#154)
- Kimi K2 Thinking Turbo: —

| Benchmark | gpt-oss-20b | Kimi K2 Thinking Turbo |
|---|---|---|
| Terminal-Bench | 3.4% | — |

## Reasoning

- gpt-oss-20b: 19.3 (#261)
- Kimi K2 Thinking Turbo: 32.5 (#75)

| Benchmark | gpt-oss-20b | Kimi K2 Thinking Turbo |
|---|---|---|
| Chess Puzzles | 4% | 20% |
| LMArena Hard Prompts | 1274 | 1428 |
| Kagi LLM Benchmark | 53.2% | — |
| CritPt | 1.4% | — |
| DTBench | 68% | — |
| LMCA | 14.5% | — |
| Epoch Capabilities Index | 137.82 | — |

## Math

- gpt-oss-20b: 39.4 (#103)
- Kimi K2 Thinking Turbo: 47.4 (#68)

| Benchmark | gpt-oss-20b | Kimi K2 Thinking Turbo |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 65.3% | 83.1% |
| LMArena Math | 1317 | 1429 |
| Omni-MATH | 56.5% | — |

## Knowledge

- gpt-oss-20b: 34.6 (#195)
- Kimi K2 Thinking Turbo: 50.9 (#69)

| Benchmark | gpt-oss-20b | Kimi K2 Thinking Turbo |
|---|---|---|
| GPQA Diamond | 60.8% | 84.2% |
| LMArena Expert | 1258 | 1439 |
| MMLU-Pro | 74% | — |
| GPQA (HELM) | 59.4% | — |

## Multilingual

- gpt-oss-20b: 42.2 (#197)
- Kimi K2 Thinking Turbo: 51.4 (#109)

| Benchmark | gpt-oss-20b | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Non-English | 1268 | 1398 |
| LMArena Chinese | 1314 | 1456 |
| LMArena German | 1255 | 1390 |
| LMArena Japanese | 1244 | 1357 |
| LMArena Korean | 1236 | 1330 |
| LMArena Russian | 1278 | 1391 |
| LMArena Spanish | 1267 | 1406 |
| LMArena French | — | 1425 |

## Instruction Following

- gpt-oss-20b: 61.8 (#240)
- Kimi K2 Thinking Turbo: 74.0 (#109)

| Benchmark | gpt-oss-20b | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Instruction Following | 1236 | 1403 |
| IFEval | 73.2% | — |

## Long Context

- gpt-oss-20b: 37.9 (#209)
- Kimi K2 Thinking Turbo: 43.2 (#102)

| Benchmark | gpt-oss-20b | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Longer Query | 1250 | 1415 |

## Writing & Preference

- gpt-oss-20b: 35.5 (#265)
- Kimi K2 Thinking Turbo: 60.0 (#104)

| Benchmark | gpt-oss-20b | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Text | 1287 | 1415 |
| LMArena Creative Writing | 1201 | 1374 |
| LMArena Multi-Turn | 1268 | 1414 |
| EQ-Bench Creative Writing | 666 | — |
| WildBench | 73.7% | — |

## FAQ

### Is gpt-oss-20b better than Kimi K2 Thinking Turbo?

Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 32.5 on the Noometry Index.

### Is gpt-oss-20b or Kimi K2 Thinking Turbo better for coding?

They score almost the same on coding (37.6 vs 38.4); test both on your own repository before choosing.

### How many benchmarks do gpt-oss-20b and Kimi K2 Thinking Turbo share?

19 benchmarks have published results for both models. gpt-oss-20b has 34 scored results on Noometry and Kimi K2 Thinking Turbo has 21.