Model comparison
Claude Sonnet 4.5 vs Qwen1.5 4b Chat
Claude Sonnet 4.5 is the stronger model overall, scoring 44.1 to 28.8 on the Noometry Index.
Last verified . 13 shared benchmarks.
Alibaba (Qwen)Summary
- They share 13 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 8 categories and Qwen1.5 4b Chat in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Claude Sonnet 4.5 leads 66.5 to 23.8.
- Qwen1.5 4b Chat has downloadable open weights; the other is API-only.
Side by side
| Claude Sonnet 4.5 | Qwen1.5 4b Chat | |
|---|---|---|
| Provider | Anthropic | Alibaba (Qwen) |
| Noometry Index | 44.1 | 28.8 |
| Released | 2025-09-29 | — |
| Weights | Proprietary | Open |
| Context window | 200K | — |
| Max output | 64K | — |
| Input $ / M tokens | $3 | — |
| Output $ / M tokens | $15 | — |
| Results tracked | 73 | 13 |
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Category by category
Coding Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 47.3 (#61), Qwen1.5 4b Chat: 29.1 (#308)
| Benchmark | Claude Sonnet 4.5 | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Coding | 1489 | 999 |
| 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), Qwen1.5 4b Chat: —
| Benchmark | Claude Sonnet 4.5 | Qwen1.5 4b Chat |
|---|---|---|
| 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), Qwen1.5 4b Chat: 18.5 (#279)
| Benchmark | Claude Sonnet 4.5 | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Hard Prompts | 1462 | 976 |
| 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 Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 32.3 (#216), Qwen1.5 4b Chat: 30.4 (#234)
| Benchmark | Claude Sonnet 4.5 | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Math | 1449 | 1026 |
| 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), Qwen1.5 4b Chat: 26.7 (#255)
| Benchmark | Claude Sonnet 4.5 | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Expert | 1482 | 980 |
| 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), Qwen1.5 4b Chat: —
| Benchmark | Claude Sonnet 4.5 | Qwen1.5 4b Chat |
|---|---|---|
| VPCT | 39.8% | — |
| LMArena Document | 1450 | — |
Multilingual Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 53.4 (#69), Qwen1.5 4b Chat: 24.1 (#290)
| Benchmark | Claude Sonnet 4.5 | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Non-English | 1425 | 979 |
| LMArena Chinese | 1459 | 1024 |
| LMArena German | 1427 | 902 |
| LMArena Russian | 1437 | 952 |
| LMArena French | 1458 | — |
| LMArena Japanese | 1390 | — |
| LMArena Korean | 1403 | — |
| LMArena Spanish | 1457 | — |
Instruction Following Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 75.0 (#78), Qwen1.5 4b Chat: 49.0 (#300)
| Benchmark | Claude Sonnet 4.5 | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Instruction Following | 1459 | 978 |
| IFEval | 85% | — |
Long Context Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 45.2 (#46), Qwen1.5 4b Chat: 30.1 (#290)
| Benchmark | Claude Sonnet 4.5 | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Longer Query | 1476 | 988 |
Writing & Preference Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 66.5 (#34), Qwen1.5 4b Chat: 23.8 (#309)
| Benchmark | Claude Sonnet 4.5 | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Text | 1439 | 997 |
| LMArena Creative Writing | 1442 | 969 |
| LMArena Multi-Turn | 1465 | 977 |
| EQ-Bench Creative Writing | 1678 | — |
| WildBench | 85.4% | — |
Frequently asked questions
Is Claude Sonnet 4.5 better than Qwen1.5 4b Chat?
Claude Sonnet 4.5 is the stronger model overall, scoring 44.1 to 28.8 on the Noometry Index.
Is Claude Sonnet 4.5 or Qwen1.5 4b Chat better for coding?
Claude Sonnet 4.5 scores higher on coding benchmarks: 47.3 versus 29.1 in the Noometry coding category.
How many benchmarks do Claude Sonnet 4.5 and Qwen1.5 4b Chat share?
13 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and Qwen1.5 4b Chat has 13.