# Claude Sonnet 4.5 vs Yi-Lightning

> Claude Sonnet 4.5 is the stronger model overall, scoring 44.1 to 37.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-sonnet-4-5-vs-yi-lightning
- Last updated: 2026-10-11
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 7 categories and Yi-Lightning in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in coding, where Claude Sonnet 4.5 leads 47.3 to 27.4.

## Snapshot

| | Claude Sonnet 4.5 | Yi-Lightning |
|---|---|---|
| Provider | Anthropic | 01.AI |
| Noometry Index | 44.1 | 37.1 |
| Rank | 81 | 209 |
| Context | 200K | — |
| Input $/M | $3 | — |
| Output $/M | $15 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 4.5: 47.3 (#61)
- Yi-Lightning: 27.4 (#320)

| Benchmark | Claude Sonnet 4.5 | Yi-Lightning |
|---|---|---|
| LMArena Coding | 1489 | 1312 |
| SWE-bench Verified | 71.3% | — |
| SWE-bench Verified (bash only) | 71.4% | — |
| Aider Polyglot | — | 12.9% |
| 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

- Claude Sonnet 4.5: 38.3 (#32)
- Yi-Lightning: —

| Benchmark | Claude Sonnet 4.5 | Yi-Lightning |
|---|---|---|
| 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: 26.9 (#125)
- Yi-Lightning: 25.9 (#139)

| Benchmark | Claude Sonnet 4.5 | Yi-Lightning |
|---|---|---|
| LMArena Hard Prompts | 1462 | 1302 |
| 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: 32.3 (#216)
- Yi-Lightning: 36.2 (#172)

| Benchmark | Claude Sonnet 4.5 | Yi-Lightning |
|---|---|---|
| LMArena Math | 1449 | 1300 |
| 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: 48.4 (#76)
- Yi-Lightning: 35.4 (#185)

| Benchmark | Claude Sonnet 4.5 | Yi-Lightning |
|---|---|---|
| LMArena Expert | 1482 | 1286 |
| 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

- Claude Sonnet 4.5: 34.8 (#89)
- Yi-Lightning: —

| Benchmark | Claude Sonnet 4.5 | Yi-Lightning |
|---|---|---|
| VPCT | 39.8% | — |
| LMArena Document | 1450 | — |

## Multilingual

- Claude Sonnet 4.5: 53.4 (#69)
- Yi-Lightning: 42.2 (#196)

| Benchmark | Claude Sonnet 4.5 | Yi-Lightning |
|---|---|---|
| LMArena Non-English | 1425 | 1269 |
| LMArena Chinese | 1459 | 1320 |
| LMArena French | 1458 | 1305 |
| LMArena German | 1427 | 1267 |
| LMArena Japanese | 1390 | 1228 |
| LMArena Korean | 1403 | 1192 |
| LMArena Russian | 1437 | 1255 |
| LMArena Spanish | 1457 | 1315 |

## Instruction Following

- Claude Sonnet 4.5: 75.0 (#78)
- Yi-Lightning: 67.4 (#196)

| Benchmark | Claude Sonnet 4.5 | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | 1459 | 1278 |
| IFEval | 85% | — |

## Long Context

- Claude Sonnet 4.5: 45.2 (#46)
- Yi-Lightning: 39.4 (#181)

| Benchmark | Claude Sonnet 4.5 | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | 1476 | 1297 |

## Writing & Preference

- Claude Sonnet 4.5: 66.5 (#34)
- Yi-Lightning: 50.2 (#184)

| Benchmark | Claude Sonnet 4.5 | Yi-Lightning |
|---|---|---|
| LMArena Text | 1439 | 1302 |
| LMArena Creative Writing | 1442 | 1280 |
| LMArena Multi-Turn | 1465 | 1311 |
| EQ-Bench Creative Writing | 1678 | — |
| WildBench | 85.4% | — |

## FAQ

### Is Claude Sonnet 4.5 better than Yi-Lightning?

Claude Sonnet 4.5 is the stronger model overall, scoring 44.1 to 37.1 on the Noometry Index.

### Is Claude Sonnet 4.5 or Yi-Lightning better for coding?

Claude Sonnet 4.5 scores higher on coding benchmarks: 47.3 versus 27.4 in the Noometry coding category.

### How many benchmarks do Claude Sonnet 4.5 and Yi-Lightning share?

17 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and Yi-Lightning has 18.