Model comparison
Claude Sonnet 4 vs Yi-1.5-34B
Claude Sonnet 4 is the stronger model overall, scoring 40.6 to 30.2 on the Noometry Index.
Last verified . 19 shared benchmarks.
Summary
- They share 19 benchmarks with published results for both. Claude Sonnet 4 scores higher in 7 categories and Yi-1.5-34B in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Claude Sonnet 4 leads 41.6 to 14.8.
- The biggest single-benchmark swing is MATH Level 5: 84.4% for Claude Sonnet 4 and 25.5% for Yi-1.5-34B.
- Yi-1.5-34B has downloadable open weights; the other is API-only.
Side by side
| Claude Sonnet 4 | Yi-1.5-34B | |
|---|---|---|
| Provider | Anthropic | 01.AI |
| Noometry Index | 40.6 | 30.2 |
| Released | 2025-05-22 | 2024-05-13 |
| Weights | Proprietary | Open |
| Context window | 200K | — |
| Max output | 64K | — |
| Input $ / M tokens | $3 | — |
| Output $ / M tokens | $15 | — |
| Results tracked | 58 | 21 |
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Category by category
Coding Claude Sonnet 4 leads
Claude Sonnet 4: 44.0 (#70), Yi-1.5-34B: 31.9 (#267)
| Benchmark | Claude Sonnet 4 | Yi-1.5-34B |
|---|---|---|
| LMArena Coding | 1414 | 1169 |
| SWE-bench Verified (bash only) | 64.9% | — |
| Aider Polyglot | 61.3% | — |
| SciCode | 40% | — |
| GSO | 4.9% | — |
| WeirdML | 46.1% | — |
| BigCodeBench Instruct | — | 33.9% |
| BigCodeBench Complete | — | 43.8% |
| ALE-Bench | 655.35 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 4: 38.3 (#29), Yi-1.5-34B: —
| Benchmark | Claude Sonnet 4 | Yi-1.5-34B |
|---|---|---|
| TheAgentCompany | 33.1% | — |
| Cybench | 35% | — |
| DeepResearch Bench | 46.6% | — |
| OSWorld | 43.9% | — |
| METR Time Horizons | 62% | — |
Reasoning Claude Sonnet 4 leads
Claude Sonnet 4: 23.0 (#169), Yi-1.5-34B: 21.5 (#195)
| Benchmark | Claude Sonnet 4 | Yi-1.5-34B |
|---|---|---|
| LMArena Hard Prompts | 1372 | 1160 |
| ARC-AGI-2 | 5.9% | — |
| SimpleBench | 45.5% | — |
| Kagi LLM Benchmark | 73% | — |
| ARC-AGI-1 | 40% | — |
| CritPt | 0.3% | — |
| EnigmaEval | 3.1% | — |
| DTBench | 77.1% | — |
| LMCA | 29% | — |
| Epoch Capabilities Index | 141.69 | — |
| ForecastBench | 60.2 | — |
Math Claude Sonnet 4 leads
Claude Sonnet 4: 41.5 (#71), Yi-1.5-34B: 25.3 (#248)
| Benchmark | Claude Sonnet 4 | Yi-1.5-34B |
|---|---|---|
| LMArena Math | 1375 | 1182 |
| MATH Level 5 | 84.4% | 25.5% |
| OTIS Mock AIME 2024-2025 | 71.1% | — |
| Omni-MATH | 60.2% | — |
| FrontierMath (Feb 2025 set) | 4.1% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Claude Sonnet 4 leads
Claude Sonnet 4: 41.6 (#99), Yi-1.5-34B: 14.8 (#290)
| Benchmark | Claude Sonnet 4 | Yi-1.5-34B |
|---|---|---|
| GPQA Diamond | 79.2% | 32% |
| LMArena Expert | 1371 | 1144 |
| Humanity's Last Exam | 7.8% | — |
| MMLU-Pro | 84.3% | — |
| Confabulations | 13.2% | — |
| Vectara Hallucination Rate | 10.3% | — |
| GPQA (HELM) | 70.6% | — |
Multimodal Not comparable
Claude Sonnet 4: 25.6 (#116), Yi-1.5-34B: —
| Benchmark | Claude Sonnet 4 | Yi-1.5-34B |
|---|---|---|
| LMArena Vision | 1191 | — |
| GeoBench | 37% | — |
| VPCT | 34% | — |
| MindCube | 44.8% | — |
Multilingual Claude Sonnet 4 leads
Claude Sonnet 4: 46.9 (#151), Yi-1.5-34B: 32.5 (#251)
| Benchmark | Claude Sonnet 4 | Yi-1.5-34B |
|---|---|---|
| LMArena Non-English | 1333 | 1121 |
| LMArena Chinese | 1351 | 1213 |
| LMArena French | 1364 | 1155 |
| LMArena German | 1331 | 1111 |
| LMArena Japanese | 1301 | 1021 |
| LMArena Korean | 1293 | 1005 |
| LMArena Russian | 1355 | 1091 |
| LMArena Spanish | 1356 | 1120 |
Instruction Following Claude Sonnet 4 leads
Claude Sonnet 4: 71.8 (#141), Yi-1.5-34B: 59.4 (#252)
| Benchmark | Claude Sonnet 4 | Yi-1.5-34B |
|---|---|---|
| LMArena Instruction Following | 1375 | 1139 |
| IFEval | 84% | — |
Long Context Yi-1.5-34B leads
Claude Sonnet 4: 33.6 (#254), Yi-1.5-34B: 34.6 (#243)
| Benchmark | Claude Sonnet 4 | Yi-1.5-34B |
|---|---|---|
| LMArena Longer Query | 1398 | 1144 |
| Fiction.LiveBench | 46.9% | — |
Writing & Preference Claude Sonnet 4 leads
Claude Sonnet 4: 57.3 (#127), Yi-1.5-34B: 37.6 (#252)
| Benchmark | Claude Sonnet 4 | Yi-1.5-34B |
|---|---|---|
| LMArena Text | 1351 | 1173 |
| LMArena Creative Writing | 1345 | 1135 |
| LMArena Multi-Turn | 1376 | 1153 |
| Short-Story Creative Writing | 81.4% | — |
| EQ-Bench Creative Writing | 1483 | — |
| WildBench | 83.8% | — |
Frequently asked questions
Is Claude Sonnet 4 better than Yi-1.5-34B?
Claude Sonnet 4 is the stronger model overall, scoring 40.6 to 30.2 on the Noometry Index.
Is Claude Sonnet 4 or Yi-1.5-34B better for coding?
Claude Sonnet 4 scores higher on coding benchmarks: 44.0 versus 31.9 in the Noometry coding category.
How many benchmarks do Claude Sonnet 4 and Yi-1.5-34B share?
19 benchmarks have published results for both models. Claude Sonnet 4 has 58 scored results on Noometry and Yi-1.5-34B has 21.