Model comparison
gpt-oss-120b vs Kimi K2 Thinking Turbo
Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 36.3 on the Noometry Index.
Last verified . 20 shared benchmarks.
Summary
- They share 20 benchmarks with published results for both. gpt-oss-120b scores higher in 1 category and Kimi K2 Thinking Turbo in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Kimi K2 Thinking Turbo leads 60.0 to 46.5.
- The biggest single-benchmark swing is GPQA Diamond: 75.8% for gpt-oss-120b and 84.2% for Kimi K2 Thinking Turbo.
Side by side
| gpt-oss-120b | Kimi K2 Thinking Turbo | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 36.3 | 45.8 |
| Released | 2025-08-05 | 2025-11-06 |
| Weights | Open | Open |
| Context window | 131K | — |
| Max output | 41K | — |
| Input $ / M tokens | $0.037 | — |
| Output $ / M tokens | $0.17 | — |
| Results tracked | 48 | 21 |
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Category by category
Coding Kimi K2 Thinking Turbo leads
gpt-oss-120b: 33.5 (#256), Kimi K2 Thinking Turbo: 38.4 (#178)
| Benchmark | gpt-oss-120b | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Coding | 1380 | 1454 |
| SWE-bench Verified (bash only) | 26% | — |
| Aider Polyglot | 41.8% | — |
| LMArena WebDev | — | 1322 |
| SciCode | 36% | — |
| WeirdML | 48.2% | — |
| ALE-Bench | 575.62 | — |
| AlgoTune | 1.41 | — |
Agentic & Tool Use Not comparable
gpt-oss-120b: 12.2 (#153), Kimi K2 Thinking Turbo: —
| Benchmark | gpt-oss-120b | Kimi K2 Thinking Turbo |
|---|---|---|
| Terminal-Bench | 18.7% | — |
| APEX-Agents | 4.4% | — |
| METR Time Horizons | 56.6% | — |
| Vending-Bench 2 | -21.53 | — |
Reasoning Kimi K2 Thinking Turbo leads
gpt-oss-120b: 20.0 (#245), Kimi K2 Thinking Turbo: 32.5 (#75)
| Benchmark | gpt-oss-120b | Kimi K2 Thinking Turbo |
|---|---|---|
| Chess Puzzles | 20% | 20% |
| LMArena Hard Prompts | 1364 | 1428 |
| SimpleBench | 22.1% | — |
| Kagi LLM Benchmark | 58.6% | — |
| CritPt | 1.1% | — |
| Mystery Game Puzzles | 2% | — |
| DTBench | 76.3% | — |
| LMCA | 22.1% | — |
| Surface Evolver Bench | 25% | — |
| Epoch Capabilities Index | 139.93 | — |
Math gpt-oss-120b leads
gpt-oss-120b: 52.5 (#50), Kimi K2 Thinking Turbo: 47.4 (#68)
| Benchmark | gpt-oss-120b | Kimi K2 Thinking Turbo |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 88.9% | 83.1% |
| LMArena Math | 1389 | 1429 |
| Omni-MATH | 68.8% | — |
Knowledge Kimi K2 Thinking Turbo leads
gpt-oss-120b: 42.4 (#96), Kimi K2 Thinking Turbo: 50.9 (#69)
| Benchmark | gpt-oss-120b | Kimi K2 Thinking Turbo |
|---|---|---|
| GPQA Diamond | 75.8% | 84.2% |
| LMArena Expert | 1356 | 1439 |
| MMLU-Pro | 79.5% | — |
| Confabulations | 15.7% | — |
| Vectara Hallucination Rate | 14.2% | — |
| GPQA (HELM) | 68.4% | — |
Multilingual Kimi K2 Thinking Turbo leads
gpt-oss-120b: 48.0 (#147), Kimi K2 Thinking Turbo: 51.4 (#109)
| Benchmark | gpt-oss-120b | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Non-English | 1351 | 1398 |
| LMArena Chinese | 1385 | 1456 |
| LMArena French | 1369 | 1425 |
| LMArena German | 1353 | 1390 |
| LMArena Japanese | 1331 | 1357 |
| LMArena Korean | 1282 | 1330 |
| LMArena Russian | 1343 | 1391 |
| LMArena Spanish | 1389 | 1406 |
Instruction Following Kimi K2 Thinking Turbo leads
gpt-oss-120b: 69.3 (#173), Kimi K2 Thinking Turbo: 74.0 (#109)
| Benchmark | gpt-oss-120b | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Instruction Following | 1318 | 1403 |
| IFEval | 83.6% | — |
Long Context Kimi K2 Thinking Turbo leads
gpt-oss-120b: 31.4 (#278), Kimi K2 Thinking Turbo: 43.2 (#102)
| Benchmark | gpt-oss-120b | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Longer Query | 1319 | 1415 |
| Fiction.LiveBench | 44.4% | — |
Writing & Preference Kimi K2 Thinking Turbo leads
gpt-oss-120b: 46.5 (#217), Kimi K2 Thinking Turbo: 60.0 (#104)
| Benchmark | gpt-oss-120b | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Text | 1365 | 1415 |
| LMArena Creative Writing | 1275 | 1374 |
| LMArena Multi-Turn | 1340 | 1414 |
| Short-Story Creative Writing | 77.1% | — |
| EQ-Bench Creative Writing | 961 | — |
| WildBench | 84.5% | — |
Frequently asked questions
Is gpt-oss-120b better than Kimi K2 Thinking Turbo?
Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 36.3 on the Noometry Index.
Is gpt-oss-120b or Kimi K2 Thinking Turbo better for coding?
Kimi K2 Thinking Turbo scores higher on coding benchmarks: 38.4 versus 33.5 in the Noometry coding category.
How many benchmarks do gpt-oss-120b and Kimi K2 Thinking Turbo share?
20 benchmarks have published results for both models. gpt-oss-120b has 48 scored results on Noometry and Kimi K2 Thinking Turbo has 21.