# Gemini 1.5 Flash (May 2024) vs gpt-oss-20b

> Gemini 1.5 Flash (May 2024) and gpt-oss-20b score almost the same on the Noometry Index (32.9 vs 32.1), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gemini-1-5-flash-vs-gpt-oss-20b
- Last updated: 2026-10-10
- Shared benchmarks: 26

## Summary

- They share 26 benchmarks with published results for both. Gemini 1.5 Flash (May 2024) scores higher in 6 categories and gpt-oss-20b in 3 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where Gemini 1.5 Flash (May 2024) leads 26.3 to 9.2.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 16.3% for Gemini 1.5 Flash (May 2024) and 65.3% for gpt-oss-20b.
- gpt-oss-20b has downloadable open weights; the other is API-only.

## Snapshot

| | Gemini 1.5 Flash (May 2024) | gpt-oss-20b |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 32.9 | 32.1 |
| Rank | 240 | 249 |
| Context | — | 131K |
| Input $/M | — | $0.018 |
| Output $/M | — | $0.09 |
| Weights | Proprietary | Open |

## Coding

- Gemini 1.5 Flash (May 2024): 33.9 (#233)
- gpt-oss-20b: 37.1 (#185)

| Benchmark | Gemini 1.5 Flash (May 2024) | gpt-oss-20b |
|---|---|---|
| WeirdML | 24.9% | 40.9% |
| LMArena Coding | 1262 | 1307 |
| SciCode | — | 34.4% |
| BigCodeBench Instruct | 43.5% | — |
| BigCodeBench Complete | 55.1% | — |
| ALE-Bench | — | 566.05 |
| HumanEval+ | 75.6% | — |
| MBPP+ | 67.5% | — |

## Agentic & Tool Use

- Gemini 1.5 Flash (May 2024): 26.3 (#97)
- gpt-oss-20b: 9.2 (#146)

| Benchmark | Gemini 1.5 Flash (May 2024) | gpt-oss-20b |
|---|---|---|
| Terminal-Bench | — | 3.4% |
| BALROG | 14.6% | — |

## Reasoning

- Gemini 1.5 Flash (May 2024): 20.8 (#212)
- gpt-oss-20b: 18.8 (#251)

| Benchmark | Gemini 1.5 Flash (May 2024) | gpt-oss-20b |
|---|---|---|
| LMArena Hard Prompts | 1257 | 1274 |
| DTBench | 53.8% | 68% |
| Epoch Capabilities Index | 129.37 | 137.81 |
| Kagi LLM Benchmark | — | 53.2% |
| CritPt | — | 1.4% |
| Chess Puzzles | — | 4% |
| LMCA | — | 14.5% |
| ForecastBench | 53.9 | — |
| PIQA | 87.5% | — |

## Math

- Gemini 1.5 Flash (May 2024): 20.8 (#274)
- gpt-oss-20b: 37.6 (#93)

| Benchmark | Gemini 1.5 Flash (May 2024) | gpt-oss-20b |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 16.3% | 65.3% |
| Omni-MATH | 30.4% | 56.5% |
| LMArena Math | 1269 | 1317 |
| MATH Level 5 | 61.9% | — |
| FrontierMath (Feb 2025 set) | 0% | — |
| GSM8K | 82.4% | — |

## Knowledge

- Gemini 1.5 Flash (May 2024): 26.2 (#253)
- gpt-oss-20b: 34.6 (#186)

| Benchmark | Gemini 1.5 Flash (May 2024) | gpt-oss-20b |
|---|---|---|
| GPQA Diamond | 47.3% | 60.8% |
| MMLU-Pro | 67.8% | 74% |
| GPQA (HELM) | 43.7% | 59.4% |
| LMArena Expert | 1233 | 1258 |
| BoolQ | 85.8% | — |
| MMLU | 77.9% | — |

## Multimodal

- Gemini 1.5 Flash (May 2024): 35.3 (#76)
- gpt-oss-20b: —

| Benchmark | Gemini 1.5 Flash (May 2024) | gpt-oss-20b |
|---|---|---|
| LMArena Vision | 1141 | — |
| Video-MME | 70.3% | — |
| GeoBench | 76% | — |

## Multilingual

- Gemini 1.5 Flash (May 2024): 43.1 (#184)
- gpt-oss-20b: 42.4 (#192)

| Benchmark | Gemini 1.5 Flash (May 2024) | gpt-oss-20b |
|---|---|---|
| LMArena Non-English | 1278 | 1269 |
| LMArena Chinese | 1295 | 1311 |
| LMArena German | 1262 | 1249 |
| LMArena Japanese | 1252 | 1245 |
| LMArena Korean | 1220 | 1239 |
| LMArena Russian | 1288 | 1279 |
| LMArena Spanish | 1242 | 1267 |
| LMArena French | 1257 | — |

## Instruction Following

- Gemini 1.5 Flash (May 2024): 67.0 (#199)
- gpt-oss-20b: 62.0 (#235)

| Benchmark | Gemini 1.5 Flash (May 2024) | gpt-oss-20b |
|---|---|---|
| IFEval | 83.1% | 73.2% |
| LMArena Instruction Following | 1258 | 1236 |

## Long Context

- Gemini 1.5 Flash (May 2024): 39.0 (#182)
- gpt-oss-20b: 37.9 (#203)

| Benchmark | Gemini 1.5 Flash (May 2024) | gpt-oss-20b |
|---|---|---|
| LMArena Longer Query | 1284 | 1251 |

## Writing & Preference

- Gemini 1.5 Flash (May 2024): 48.9 (#190)
- gpt-oss-20b: 35.8 (#260)

| Benchmark | Gemini 1.5 Flash (May 2024) | gpt-oss-20b |
|---|---|---|
| LMArena Text | 1287 | 1288 |
| LMArena Creative Writing | 1285 | 1201 |
| WildBench | 79.2% | 73.7% |
| LMArena Multi-Turn | 1253 | 1268 |
| EQ-Bench Creative Writing | — | 666 |

## FAQ

### Is Gemini 1.5 Flash (May 2024) better than gpt-oss-20b?

Gemini 1.5 Flash (May 2024) and gpt-oss-20b score almost the same on the Noometry Index (32.9 vs 32.1), so choose on price, context window or the category you care about most.

### Is Gemini 1.5 Flash (May 2024) or gpt-oss-20b better for coding?

gpt-oss-20b scores higher on coding benchmarks: 37.1 versus 33.9 in the Noometry coding category.

### How many benchmarks do Gemini 1.5 Flash (May 2024) and gpt-oss-20b share?

26 benchmarks have published results for both models. Gemini 1.5 Flash (May 2024) has 42 scored results on Noometry and gpt-oss-20b has 34.