Model comparison
Amazon Nova Experimental Chat 10 09 vs gpt-oss-20b
Amazon Nova Experimental Chat 10 09 is the stronger model overall, scoring 41.4 to 32.1 on the Noometry Index.
Last verified . 9 shared benchmarks.
Summary
- They share 9 benchmarks with published results for both. Amazon Nova Experimental Chat 10 09 scores higher in 6 categories and gpt-oss-20b in 0 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Amazon Nova Experimental Chat 10 09 leads 55.0 to 35.8.
- gpt-oss-20b has downloadable open weights; the other is API-only.
Side by side
| Amazon Nova Experimental Chat 10 09 | gpt-oss-20b | |
|---|---|---|
| Provider | Amazon | OpenAI |
| Noometry Index | 41.4 | 32.1 |
| Released | — | 2025-08-05 |
| Weights | Proprietary | Open |
| Context window | — | 131K |
| Max output | — | 16K |
| Input $ / M tokens | — | $0.018 |
| Output $ / M tokens | — | $0.09 |
| Results tracked | 9 | 34 |
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Category by category
Coding Amazon Nova Experimental Chat 10 09 leads
Amazon Nova Experimental Chat 10 09: 39.6 (#142), gpt-oss-20b: 37.1 (#185)
| Benchmark | Amazon Nova Experimental Chat 10 09 | gpt-oss-20b |
|---|---|---|
| LMArena Coding | 1371 | 1307 |
| SciCode | — | 34.4% |
| WeirdML | — | 40.9% |
| ALE-Bench | — | 566.05 |
Agentic & Tool Use Not comparable
Amazon Nova Experimental Chat 10 09: —, gpt-oss-20b: 9.2 (#146)
| Benchmark | Amazon Nova Experimental Chat 10 09 | gpt-oss-20b |
|---|---|---|
| Terminal-Bench | — | 3.4% |
Reasoning Amazon Nova Experimental Chat 10 09 leads
Amazon Nova Experimental Chat 10 09: 26.2 (#122), gpt-oss-20b: 18.8 (#251)
| Benchmark | Amazon Nova Experimental Chat 10 09 | gpt-oss-20b |
|---|---|---|
| LMArena Hard Prompts | 1356 | 1274 |
| Kagi LLM Benchmark | — | 53.2% |
| CritPt | — | 1.4% |
| Chess Puzzles | — | 4% |
| DTBench | — | 68% |
| LMCA | — | 14.5% |
| Epoch Capabilities Index | — | 137.81 |
Math Not comparable
Amazon Nova Experimental Chat 10 09: —, gpt-oss-20b: 37.6 (#93)
| Benchmark | Amazon Nova Experimental Chat 10 09 | gpt-oss-20b |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 65.3% |
| Omni-MATH | — | 56.5% |
| LMArena Math | — | 1317 |
Knowledge Not comparable
Amazon Nova Experimental Chat 10 09: —, gpt-oss-20b: 34.6 (#186)
| Benchmark | Amazon Nova Experimental Chat 10 09 | gpt-oss-20b |
|---|---|---|
| GPQA Diamond | — | 60.8% |
| MMLU-Pro | — | 74% |
| GPQA (HELM) | — | 59.4% |
| LMArena Expert | — | 1258 |
Multilingual Amazon Nova Experimental Chat 10 09 leads
Amazon Nova Experimental Chat 10 09: 47.5 (#145), gpt-oss-20b: 42.4 (#192)
| Benchmark | Amazon Nova Experimental Chat 10 09 | gpt-oss-20b |
|---|---|---|
| LMArena Non-English | 1341 | 1269 |
| LMArena Chinese | 1345 | 1311 |
| LMArena German | — | 1249 |
| LMArena Japanese | — | 1245 |
| LMArena Korean | — | 1239 |
| LMArena Russian | — | 1279 |
| LMArena Spanish | — | 1267 |
Instruction Following Amazon Nova Experimental Chat 10 09 leads
Amazon Nova Experimental Chat 10 09: 69.7 (#167), gpt-oss-20b: 62.0 (#235)
| Benchmark | Amazon Nova Experimental Chat 10 09 | gpt-oss-20b |
|---|---|---|
| LMArena Instruction Following | 1316 | 1236 |
| IFEval | — | 73.2% |
Long Context Amazon Nova Experimental Chat 10 09 leads
Amazon Nova Experimental Chat 10 09: 40.6 (#146), gpt-oss-20b: 37.9 (#203)
| Benchmark | Amazon Nova Experimental Chat 10 09 | gpt-oss-20b |
|---|---|---|
| LMArena Longer Query | 1334 | 1251 |
Writing & Preference Amazon Nova Experimental Chat 10 09 leads
Amazon Nova Experimental Chat 10 09: 55.0 (#144), gpt-oss-20b: 35.8 (#260)
| Benchmark | Amazon Nova Experimental Chat 10 09 | gpt-oss-20b |
|---|---|---|
| LMArena Text | 1365 | 1288 |
| LMArena Creative Writing | 1307 | 1201 |
| LMArena Multi-Turn | 1354 | 1268 |
| EQ-Bench Creative Writing | — | 666 |
| WildBench | — | 73.7% |
Frequently asked questions
Is Amazon Nova Experimental Chat 10 09 better than gpt-oss-20b?
Amazon Nova Experimental Chat 10 09 is the stronger model overall, scoring 41.4 to 32.1 on the Noometry Index.
Is Amazon Nova Experimental Chat 10 09 or gpt-oss-20b better for coding?
Amazon Nova Experimental Chat 10 09 scores higher on coding benchmarks: 39.6 versus 37.1 in the Noometry coding category.
How many benchmarks do Amazon Nova Experimental Chat 10 09 and gpt-oss-20b share?
9 benchmarks have published results for both models. Amazon Nova Experimental Chat 10 09 has 9 scored results on Noometry and gpt-oss-20b has 34.