# Amazon Nova Micro vs gpt-oss-20b

> gpt-oss-20b is the stronger model overall, scoring 32.1 to 29.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/amazon-nova-micro-vs-gpt-oss-20b
- Last updated: 2026-10-10
- Shared benchmarks: 21

## Summary

- They share 21 benchmarks with published results for both. Amazon Nova Micro scores higher in 2 categories and gpt-oss-20b in 7 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where gpt-oss-20b leads 37.6 to 24.9.
- The biggest single-benchmark swing is Omni-MATH: 21.4% for Amazon Nova Micro and 56.5% for gpt-oss-20b.
- gpt-oss-20b is cheaper at $0.018 / $0.09 per million input/output tokens, against $0.035 / $0.14 for Amazon Nova Micro.
- gpt-oss-20b accepts more context: 131K tokens versus 128K.
- gpt-oss-20b has downloadable open weights; the other is API-only.

## Snapshot

| | Amazon Nova Micro | gpt-oss-20b |
|---|---|---|
| Provider | Amazon | OpenAI |
| Noometry Index | 29.9 | 32.1 |
| Rank | 290 | 249 |
| Context | 128K | 131K |
| Input $/M | $0.035 | $0.018 |
| Output $/M | $0.14 | $0.09 |
| Weights | Proprietary | Open |

## Coding

- Amazon Nova Micro: 30.0 (#289)
- gpt-oss-20b: 37.1 (#185)

| Benchmark | Amazon Nova Micro | gpt-oss-20b |
|---|---|---|
| LMArena Coding | 1218 | 1307 |
| SciCode | — | 34.4% |
| WeirdML | — | 40.9% |
| LiveBench Coding | 20.2% | — |
| ALE-Bench | — | 566.05 |

## Agentic & Tool Use

- Amazon Nova Micro: 21.9 (#125)
- gpt-oss-20b: 9.2 (#146)

| Benchmark | Amazon Nova Micro | gpt-oss-20b |
|---|---|---|
| Terminal-Bench | — | 3.4% |
| Berkeley Function Calling Leaderboard | 22.3% | — |

## Reasoning

- Amazon Nova Micro: 16.7 (#289)
- gpt-oss-20b: 18.8 (#251)

| Benchmark | Amazon Nova Micro | gpt-oss-20b |
|---|---|---|
| LMArena Hard Prompts | 1191 | 1274 |
| Kagi LLM Benchmark | — | 53.2% |
| CritPt | — | 1.4% |
| Chess Puzzles | — | 4% |
| LiveBench Reasoning | 25.1% | — |
| DTBench | — | 68% |
| LiveBench Data Analysis | 34% | — |
| LMCA | — | 14.5% |
| Epoch Capabilities Index | — | 137.81 |
| LiveBench | 29.6% | — |

## Math

- Amazon Nova Micro: 24.9 (#252)
- gpt-oss-20b: 37.6 (#93)

| Benchmark | Amazon Nova Micro | gpt-oss-20b |
|---|---|---|
| Omni-MATH | 21.4% | 56.5% |
| LMArena Math | 1206 | 1317 |
| OTIS Mock AIME 2024-2025 | — | 65.3% |
| LiveBench Math | 34.5% | — |

## Knowledge

- Amazon Nova Micro: 29.2 (#231)
- gpt-oss-20b: 34.6 (#186)

| Benchmark | Amazon Nova Micro | gpt-oss-20b |
|---|---|---|
| MMLU-Pro | 51.1% | 74% |
| GPQA (HELM) | 38.3% | 59.4% |
| LMArena Expert | 1184 | 1258 |
| GPQA Diamond | — | 60.8% |
| Vectara Hallucination Rate | 5.5% | — |
| MMLU | 70.8% | — |

## Multilingual

- Amazon Nova Micro: 36.7 (#234)
- gpt-oss-20b: 42.4 (#192)

| Benchmark | Amazon Nova Micro | gpt-oss-20b |
|---|---|---|
| LMArena Non-English | 1186 | 1269 |
| LMArena Chinese | 1209 | 1311 |
| LMArena German | 1192 | 1249 |
| LMArena Japanese | 1154 | 1245 |
| LMArena Korean | 1150 | 1239 |
| LMArena Russian | 1185 | 1279 |
| LMArena Spanish | 1225 | 1267 |
| LMArena French | 1237 | — |

## Instruction Following

- Amazon Nova Micro: 56.6 (#267)
- gpt-oss-20b: 62.0 (#235)

| Benchmark | Amazon Nova Micro | gpt-oss-20b |
|---|---|---|
| IFEval | 76% | 73.2% |
| LMArena Instruction Following | 1174 | 1236 |
| LiveBench Instruction Following | 48% | — |

## Long Context

- Amazon Nova Micro: 36.5 (#224)
- gpt-oss-20b: 37.9 (#203)

| Benchmark | Amazon Nova Micro | gpt-oss-20b |
|---|---|---|
| LMArena Longer Query | 1206 | 1251 |

## Writing & Preference

- Amazon Nova Micro: 39.7 (#242)
- gpt-oss-20b: 35.8 (#260)

| Benchmark | Amazon Nova Micro | gpt-oss-20b |
|---|---|---|
| LMArena Text | 1208 | 1288 |
| LMArena Creative Writing | 1172 | 1201 |
| WildBench | 74.3% | 73.7% |
| LMArena Multi-Turn | 1178 | 1268 |
| EQ-Bench Creative Writing | — | 666 |
| LiveBench Language | 15.8% | — |

## FAQ

### Is Amazon Nova Micro better than gpt-oss-20b?

gpt-oss-20b is the stronger model overall, scoring 32.1 to 29.9 on the Noometry Index.

### Which is cheaper, Amazon Nova Micro or gpt-oss-20b?

gpt-oss-20b is cheaper. It lists at $0.018 per million input tokens and $0.09 per million output tokens; Amazon Nova Micro lists at $0.035 and $0.14.

### Is Amazon Nova Micro or gpt-oss-20b better for coding?

gpt-oss-20b scores higher on coding benchmarks: 37.1 versus 30.0 in the Noometry coding category.

### Which has the bigger context window?

gpt-oss-20b does, with 131K tokens against 128K.

### How many benchmarks do Amazon Nova Micro and gpt-oss-20b share?

21 benchmarks have published results for both models. Amazon Nova Micro has 32 scored results on Noometry and gpt-oss-20b has 34.