Model comparison
Claude Sonnet 4.5 vs Qwen2.5 Plus 1127
Claude Sonnet 4.5 is the stronger model overall, scoring 44.1 to 38.8 on the Noometry Index.
Last verified . 14 shared benchmarks.
Alibaba (Qwen)Summary
- They share 14 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 7 categories and Qwen2.5 Plus 1127 in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Claude Sonnet 4.5 leads 66.5 to 49.4.
Side by side
| Claude Sonnet 4.5 | Qwen2.5 Plus 1127 | |
|---|---|---|
| Provider | Anthropic | Alibaba (Qwen) |
| Noometry Index | 44.1 | 38.8 |
| Released | 2025-09-29 | — |
| Weights | Proprietary | Proprietary |
| Context window | 200K | — |
| Max output | 64K | — |
| Input $ / M tokens | $3 | — |
| Output $ / M tokens | $15 | — |
| Results tracked | 73 | 14 |
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Category by category
Coding Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 47.3 (#61), Qwen2.5 Plus 1127: 38.5 (#175)
| Benchmark | Claude Sonnet 4.5 | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Coding | 1489 | 1314 |
| SWE-bench Verified | 71.3% | — |
| SWE-bench Verified (bash only) | 71.4% | — |
| LMArena WebDev | 1393 | — |
| SWE-bench Multilingual | 67% | — |
| SciCode | 44.7% | — |
| GSO | 14.7% | — |
| WeirdML | 47.7% | — |
| ALE-Bench | 796.15 | — |
| AlgoTune | 1.52 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 4.5: 38.3 (#32), Qwen2.5 Plus 1127: —
| Benchmark | Claude Sonnet 4.5 | Qwen2.5 Plus 1127 |
|---|---|---|
| Terminal-Bench | 46.5% | — |
| Berkeley Function Calling Leaderboard | 73.2% | — |
| GDPval | 42.5% | — |
| Remote Labor Index | 2.1% | — |
| τ²-bench Airline | 72% | — |
| τ²-bench Banking | 25.3% | — |
| τ²-bench Retail | 72.4% | — |
| τ²-bench Telecom | 84.9% | — |
| Cybench | 60% | — |
| DeepResearch Bench | 52.6% | — |
| OSWorld | 62.9% | — |
| LMArena Search | 1159 | — |
| METR Time Horizons | 67.4% | — |
| Vending-Bench 2 | 3,839 | — |
Reasoning Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 26.9 (#125), Qwen2.5 Plus 1127: 25.9 (#141)
| Benchmark | Claude Sonnet 4.5 | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Hard Prompts | 1462 | 1299 |
| ARC-AGI-2 | 13.6% | — |
| SimpleBench | 54.3% | — |
| Kagi LLM Benchmark | 57.9% | — |
| NYT Connections (extended) | 37.3% | — |
| ARC-AGI-1 | 63.7% | — |
| CritPt | 1.1% | — |
| Chess Puzzles | 12% | — |
| EnigmaEval | 6% | — |
| EBR-Bench | 2.4% | — |
| Mystery Game Puzzles | 17% | — |
| DTBench | 83.2% | — |
| LMCA | 38.8% | — |
| Epoch Capabilities Index | 146.84 | — |
| ForecastBench | 61.9 | — |
Math Qwen2.5 Plus 1127 leads
Claude Sonnet 4.5: 32.3 (#216), Qwen2.5 Plus 1127: 36.1 (#174)
| Benchmark | Claude Sonnet 4.5 | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Math | 1449 | 1298 |
| FrontierMath (Tiers 1-3) | 23.9% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 77.8% | — |
| ProofBench | 19% | — |
| Omni-MATH | 55.3% | — |
| MATH Level 5 | 97.7% | — |
| FrontierMath (Feb 2025 set) | 15.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 48.4 (#76), Qwen2.5 Plus 1127: 35.5 (#183)
| Benchmark | Claude Sonnet 4.5 | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Expert | 1482 | 1289 |
| GPQA Diamond | 82.3% | — |
| Humanity's Last Exam | 13.7% | — |
| SimpleQA Verified | 30.7% | — |
| MMLU-Pro | 86.9% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 68.6% | — |
Multimodal Not comparable
Claude Sonnet 4.5: 34.8 (#89), Qwen2.5 Plus 1127: —
| Benchmark | Claude Sonnet 4.5 | Qwen2.5 Plus 1127 |
|---|---|---|
| VPCT | 39.8% | — |
| LMArena Document | 1450 | — |
Multilingual Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 53.4 (#69), Qwen2.5 Plus 1127: 41.9 (#201)
| Benchmark | Claude Sonnet 4.5 | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Non-English | 1425 | 1265 |
| LMArena Chinese | 1459 | 1314 |
| LMArena German | 1427 | 1231 |
| LMArena Japanese | 1390 | 1207 |
| LMArena Russian | 1437 | 1271 |
| LMArena French | 1458 | — |
| LMArena Korean | 1403 | — |
| LMArena Spanish | 1457 | — |
Instruction Following Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 75.0 (#78), Qwen2.5 Plus 1127: 67.2 (#199)
| Benchmark | Claude Sonnet 4.5 | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Instruction Following | 1459 | 1275 |
| IFEval | 85% | — |
Long Context Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 45.2 (#46), Qwen2.5 Plus 1127: 39.2 (#184)
| Benchmark | Claude Sonnet 4.5 | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Longer Query | 1476 | 1292 |
Writing & Preference Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 66.5 (#34), Qwen2.5 Plus 1127: 49.4 (#192)
| Benchmark | Claude Sonnet 4.5 | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Text | 1439 | 1299 |
| LMArena Creative Writing | 1442 | 1262 |
| LMArena Multi-Turn | 1465 | 1299 |
| EQ-Bench Creative Writing | 1678 | — |
| WildBench | 85.4% | — |
Frequently asked questions
Is Claude Sonnet 4.5 better than Qwen2.5 Plus 1127?
Claude Sonnet 4.5 is the stronger model overall, scoring 44.1 to 38.8 on the Noometry Index.
Is Claude Sonnet 4.5 or Qwen2.5 Plus 1127 better for coding?
Claude Sonnet 4.5 scores higher on coding benchmarks: 47.3 versus 38.5 in the Noometry coding category.
How many benchmarks do Claude Sonnet 4.5 and Qwen2.5 Plus 1127 share?
14 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and Qwen2.5 Plus 1127 has 14.