Model comparison
gpt-oss-20b vs Qwen3.5 Max Preview
Qwen3.5 Max Preview is the stronger model overall, scoring 45.3 to 32.5 on the Noometry Index.
Last verified . 16 shared benchmarks.
Alibaba (Qwen)Summary
- They share 16 benchmarks with published results for both. gpt-oss-20b scores higher in 0 categories and Qwen3.5 Max Preview in 8 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Qwen3.5 Max Preview leads 66.0 to 35.5.
- gpt-oss-20b has downloadable open weights; the other is API-only.
Side by side
| gpt-oss-20b | Qwen3.5 Max Preview | |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 32.5 | 45.3 |
| Released | 2025-08-05 | — |
| Weights | Open | Proprietary |
| Context window | 131K | — |
| Max output | 16K | — |
| Input $ / M tokens | $0.018 | — |
| Output $ / M tokens | $0.09 | — |
| Results tracked | 34 | 17 |
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Category by category
Coding Qwen3.5 Max Preview leads
gpt-oss-20b: 37.6 (#192), Qwen3.5 Max Preview: 44.0 (#77)
| Benchmark | gpt-oss-20b | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Coding | 1306 | 1487 |
| SciCode | 34.4% | — |
| WeirdML | 40.9% | — |
| ALE-Bench | 566.05 | — |
Agentic & Tool Use Not comparable
gpt-oss-20b: 9.3 (#154), Qwen3.5 Max Preview: —
| Benchmark | gpt-oss-20b | Qwen3.5 Max Preview |
|---|---|---|
| Terminal-Bench | 3.4% | — |
Reasoning Qwen3.5 Max Preview leads
gpt-oss-20b: 19.3 (#261), Qwen3.5 Max Preview: 30.8 (#84)
| Benchmark | gpt-oss-20b | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Hard Prompts | 1274 | 1483 |
| Kagi LLM Benchmark | 53.2% | — |
| CritPt | 1.4% | — |
| Chess Puzzles | 4% | — |
| DTBench | 68% | — |
| LMCA | 14.5% | — |
| Epoch Capabilities Index | 137.82 | — |
Math Too close to call
gpt-oss-20b: 39.4 (#103), Qwen3.5 Max Preview: 40.1 (#94)
| Benchmark | gpt-oss-20b | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Math | 1317 | 1474 |
| OTIS Mock AIME 2024-2025 | 65.3% | — |
| Omni-MATH | 56.5% | — |
Knowledge Qwen3.5 Max Preview leads
gpt-oss-20b: 34.6 (#195), Qwen3.5 Max Preview: 41.8 (#107)
| Benchmark | gpt-oss-20b | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Expert | 1258 | 1489 |
| GPQA Diamond | 60.8% | — |
| MMLU-Pro | 74% | — |
| GPQA (HELM) | 59.4% | — |
Multilingual Qwen3.5 Max Preview leads
gpt-oss-20b: 42.2 (#197), Qwen3.5 Max Preview: 56.2 (#22)
| Benchmark | gpt-oss-20b | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Non-English | 1268 | 1465 |
| LMArena Chinese | 1314 | 1534 |
| LMArena German | 1255 | 1487 |
| LMArena Japanese | 1244 | 1495 |
| LMArena Korean | 1236 | 1438 |
| LMArena Russian | 1278 | 1471 |
| LMArena Spanish | 1267 | 1470 |
| LMArena French | — | 1484 |
Instruction Following Qwen3.5 Max Preview leads
gpt-oss-20b: 61.8 (#240), Qwen3.5 Max Preview: 77.0 (#31)
| Benchmark | gpt-oss-20b | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Instruction Following | 1236 | 1467 |
| IFEval | 73.2% | — |
Long Context Qwen3.5 Max Preview leads
gpt-oss-20b: 37.9 (#209), Qwen3.5 Max Preview: 45.2 (#45)
| Benchmark | gpt-oss-20b | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Longer Query | 1250 | 1476 |
Writing & Preference Qwen3.5 Max Preview leads
gpt-oss-20b: 35.5 (#265), Qwen3.5 Max Preview: 66.0 (#41)
| Benchmark | gpt-oss-20b | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Text | 1287 | 1470 |
| LMArena Creative Writing | 1201 | 1464 |
| LMArena Multi-Turn | 1268 | 1478 |
| EQ-Bench Creative Writing | 666 | — |
| WildBench | 73.7% | — |
Frequently asked questions
Is gpt-oss-20b better than Qwen3.5 Max Preview?
Qwen3.5 Max Preview is the stronger model overall, scoring 45.3 to 32.5 on the Noometry Index.
Is gpt-oss-20b or Qwen3.5 Max Preview better for coding?
Qwen3.5 Max Preview scores higher on coding benchmarks: 44.0 versus 37.6 in the Noometry coding category.
How many benchmarks do gpt-oss-20b and Qwen3.5 Max Preview share?
16 benchmarks have published results for both models. gpt-oss-20b has 34 scored results on Noometry and Qwen3.5 Max Preview has 17.