# gpt-oss-120b vs Longcat Flash Chat

> Longcat Flash Chat is the stronger model overall, scoring 42.1 to 36.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-oss-120b-vs-longcat-flash-chat
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. gpt-oss-120b scores higher in 3 categories and Longcat Flash Chat in 5 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Longcat Flash Chat leads 61.0 to 46.5.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 58.6% for gpt-oss-120b and 43.9% for Longcat Flash Chat.

## Snapshot

| | gpt-oss-120b | Longcat Flash Chat |
|---|---|---|
| Provider | OpenAI | Meituan |
| Noometry Index | 36.3 | 42.1 |
| Rank | 217 | 120 |
| Context | 131K | — |
| Input $/M | $0.037 | — |
| Output $/M | $0.17 | — |
| Weights | Open | Open |

## Coding

- gpt-oss-120b: 33.5 (#256)
- Longcat Flash Chat: 43.5 (#87)

| Benchmark | gpt-oss-120b | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1380 | 1471 |
| SWE-bench Verified (bash only) | 26% | — |
| Aider Polyglot | 41.8% | — |
| SciCode | 36% | — |
| WeirdML | 48.2% | — |
| ALE-Bench | 575.62 | — |
| AlgoTune | 1.41 | — |

## Agentic & Tool Use

- gpt-oss-120b: 12.2 (#153)
- Longcat Flash Chat: —

| Benchmark | gpt-oss-120b | Longcat Flash Chat |
|---|---|---|
| Terminal-Bench | 18.7% | — |
| APEX-Agents | 4.4% | — |
| METR Time Horizons | 56.6% | — |
| Vending-Bench 2 | -21.53 | — |

## Reasoning

- gpt-oss-120b: 20.0 (#245)
- Longcat Flash Chat: 19.0 (#272)

| Benchmark | gpt-oss-120b | Longcat Flash Chat |
|---|---|---|
| Kagi LLM Benchmark | 58.6% | 43.9% |
| LMArena Hard Prompts | 1364 | 1440 |
| SimpleBench | 22.1% | — |
| NYT Connections (extended) | — | 17.7% |
| CritPt | 1.1% | — |
| Chess Puzzles | 20% | — |
| Mystery Game Puzzles | 2% | — |
| DTBench | 76.3% | — |
| LMCA | 22.1% | — |
| Surface Evolver Bench | 25% | — |
| Epoch Capabilities Index | 139.93 | — |

## Math

- gpt-oss-120b: 52.5 (#50)
- Longcat Flash Chat: 39.4 (#107)

| Benchmark | gpt-oss-120b | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1389 | 1442 |
| OTIS Mock AIME 2024-2025 | 88.9% | — |
| Omni-MATH | 68.8% | — |

## Knowledge

- gpt-oss-120b: 42.4 (#96)
- Longcat Flash Chat: 40.6 (#116)

| Benchmark | gpt-oss-120b | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1356 | 1454 |
| GPQA Diamond | 75.8% | — |
| MMLU-Pro | 79.5% | — |
| Confabulations | 15.7% | — |
| Vectara Hallucination Rate | 14.2% | — |
| GPQA (HELM) | 68.4% | — |

## Multilingual

- gpt-oss-120b: 48.0 (#147)
- Longcat Flash Chat: 51.9 (#101)

| Benchmark | gpt-oss-120b | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1351 | 1404 |
| LMArena Chinese | 1385 | 1465 |
| LMArena French | 1369 | 1456 |
| LMArena German | 1353 | 1408 |
| LMArena Japanese | 1331 | 1373 |
| LMArena Korean | 1282 | 1371 |
| LMArena Russian | 1343 | 1395 |
| LMArena Spanish | 1389 | 1445 |

## Instruction Following

- gpt-oss-120b: 69.3 (#173)
- Longcat Flash Chat: 74.4 (#96)

| Benchmark | gpt-oss-120b | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1318 | 1411 |
| IFEval | 83.6% | — |

## Long Context

- gpt-oss-120b: 31.4 (#278)
- Longcat Flash Chat: 43.5 (#93)

| Benchmark | gpt-oss-120b | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1319 | 1425 |
| Fiction.LiveBench | 44.4% | — |

## Writing & Preference

- gpt-oss-120b: 46.5 (#217)
- Longcat Flash Chat: 61.0 (#91)

| Benchmark | gpt-oss-120b | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1365 | 1427 |
| LMArena Creative Writing | 1275 | 1388 |
| LMArena Multi-Turn | 1340 | 1418 |
| Short-Story Creative Writing | 77.1% | — |
| EQ-Bench Creative Writing | 961 | — |
| WildBench | 84.5% | — |

## FAQ

### Is gpt-oss-120b better than Longcat Flash Chat?

Longcat Flash Chat is the stronger model overall, scoring 42.1 to 36.3 on the Noometry Index.

### Is gpt-oss-120b or Longcat Flash Chat better for coding?

Longcat Flash Chat scores higher on coding benchmarks: 43.5 versus 33.5 in the Noometry coding category.

### How many benchmarks do gpt-oss-120b and Longcat Flash Chat share?

18 benchmarks have published results for both models. gpt-oss-120b has 48 scored results on Noometry and Longcat Flash Chat has 19.