Model comparison
Qwen2.5 Plus 1127 vs Qwen3.5 397B-A17B
Qwen3.5 397B-A17B is the stronger model overall, scoring 46.0 to 38.8 on the Noometry Index.
Last verified . 14 shared benchmarks.
Alibaba (Qwen)Summary
- They share 14 benchmarks with published results for both. Qwen2.5 Plus 1127 scores higher in 0 categories and Qwen3.5 397B-A17B in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Qwen3.5 397B-A17B leads 53.3 to 35.5.
- Qwen3.5 397B-A17B has downloadable open weights; the other is API-only.
Side by side
| Qwen2.5 Plus 1127 | Qwen3.5 397B-A17B | |
|---|---|---|
| Provider | Alibaba (Qwen) | Alibaba (Qwen) |
| Noometry Index | 38.8 | 46.0 |
| Released | — | 2026-02-01 |
| Weights | Proprietary | Open |
| Context window | — | 262K |
| Max output | — | 66K |
| Input $ / M tokens | — | $0.60 |
| Output $ / M tokens | — | $3.60 |
| Results tracked | 14 | 36 |
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Category by category
Coding Qwen3.5 397B-A17B leads
Qwen2.5 Plus 1127: 38.5 (#175), Qwen3.5 397B-A17B: 42.0 (#114)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5 397B-A17B |
|---|---|---|
| LMArena Coding | 1314 | 1465 |
| LMArena WebDev | — | 1400 |
Agentic & Tool Use Not comparable
Qwen2.5 Plus 1127: —, Qwen3.5 397B-A17B: 33.3 (#53)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5 397B-A17B |
|---|---|---|
| APEX-Agents | — | 24.9% |
| τ²-bench Airline | — | 81.5% |
| τ²-bench Banking | — | 9.8% |
| τ²-bench Retail | — | 84.4% |
| τ²-bench Telecom | — | 97.8% |
Reasoning Qwen3.5 397B-A17B leads
Qwen2.5 Plus 1127: 25.9 (#141), Qwen3.5 397B-A17B: 34.5 (#70)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5 397B-A17B |
|---|---|---|
| LMArena Hard Prompts | 1299 | 1448 |
| Kagi LLM Benchmark | — | 73.7% |
| NYT Connections (extended) | — | 58.9% |
| Chess Puzzles | — | 13% |
| Thematic Generalization | — | 65.1% |
| Mystery Game Puzzles | — | 18% |
| DTBench | — | 87.5% |
| LMCA | — | 37.9% |
| Epoch Capabilities Index | — | 146.65 |
Math Qwen3.5 397B-A17B leads
Qwen2.5 Plus 1127: 36.1 (#174), Qwen3.5 397B-A17B: 46.1 (#73)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5 397B-A17B |
|---|---|---|
| LMArena Math | 1298 | 1454 |
| FrontierMath (Tiers 1-3) | — | 31.2% |
| OTIS Mock AIME 2024-2025 | — | 88.9% |
Knowledge Qwen3.5 397B-A17B leads
Qwen2.5 Plus 1127: 35.5 (#183), Qwen3.5 397B-A17B: 53.3 (#58)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5 397B-A17B |
|---|---|---|
| LMArena Expert | 1289 | 1462 |
| GPQA Diamond | — | 86.4% |
Multimodal Not comparable
Qwen2.5 Plus 1127: —, Qwen3.5 397B-A17B: 40.7 (#44)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5 397B-A17B |
|---|---|---|
| LMArena Vision | — | 1263 |
Multilingual Qwen3.5 397B-A17B leads
Qwen2.5 Plus 1127: 41.9 (#201), Qwen3.5 397B-A17B: 53.7 (#59)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5 397B-A17B |
|---|---|---|
| LMArena Non-English | 1265 | 1430 |
| LMArena Chinese | 1314 | 1500 |
| LMArena German | 1231 | 1447 |
| LMArena Japanese | 1207 | 1426 |
| LMArena Russian | 1271 | 1429 |
| LMArena French | — | 1461 |
| LMArena Korean | — | 1384 |
| LMArena Spanish | — | 1441 |
Instruction Following Qwen3.5 397B-A17B leads
Qwen2.5 Plus 1127: 67.2 (#199), Qwen3.5 397B-A17B: 75.0 (#77)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5 397B-A17B |
|---|---|---|
| LMArena Instruction Following | 1275 | 1424 |
Long Context Qwen3.5 397B-A17B leads
Qwen2.5 Plus 1127: 39.2 (#184), Qwen3.5 397B-A17B: 44.1 (#74)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5 397B-A17B |
|---|---|---|
| LMArena Longer Query | 1292 | 1442 |
Writing & Preference Qwen3.5 397B-A17B leads
Qwen2.5 Plus 1127: 49.4 (#192), Qwen3.5 397B-A17B: 62.3 (#79)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5 397B-A17B |
|---|---|---|
| LMArena Text | 1299 | 1438 |
| LMArena Creative Writing | 1262 | 1401 |
| LMArena Multi-Turn | 1299 | 1446 |
| EQ-Bench Creative Writing | — | 1478 |
Frequently asked questions
Is Qwen2.5 Plus 1127 better than Qwen3.5 397B-A17B?
Qwen3.5 397B-A17B is the stronger model overall, scoring 46.0 to 38.8 on the Noometry Index.
Is Qwen2.5 Plus 1127 or Qwen3.5 397B-A17B better for coding?
Qwen3.5 397B-A17B scores higher on coding benchmarks: 42.0 versus 38.5 in the Noometry coding category.
How many benchmarks do Qwen2.5 Plus 1127 and Qwen3.5 397B-A17B share?
14 benchmarks have published results for both models. Qwen2.5 Plus 1127 has 14 scored results on Noometry and Qwen3.5 397B-A17B has 36.