# Claude Opus 4.8 vs Yi-1.5-34B

> Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 30.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-opus-4-8-vs-yi-1-5-34b
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Claude Opus 4.8 scores higher in 8 categories and Yi-1.5-34B in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 4.8 leads 78.4 to 27.5.
- The biggest single-benchmark swing is GPQA Diamond: 91% for Claude Opus 4.8 and 32% for Yi-1.5-34B.
- Yi-1.5-34B has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Opus 4.8 | Yi-1.5-34B |
|---|---|---|
| Provider | Anthropic | 01.AI |
| Noometry Index | 60.7 | 30.6 |
| Rank | 13 | 289 |
| Context | 1M | — |
| Input $/M | $5 | — |
| Output $/M | $25 | — |
| Weights | Proprietary | Open |

## Coding

- Claude Opus 4.8: 59.9 (#12)
- Yi-1.5-34B: 32.4 (#272)

| Benchmark | Claude Opus 4.8 | Yi-1.5-34B |
|---|---|---|
| LMArena Coding | 1490 | 1169 |
| DeepSWE | 59% | — |
| FrontierCode | 46.5% | — |
| LMArena WebDev | 1556 | — |
| SciCode | 53.5% | — |
| GSO | 47.1% | — |
| WeirdML | 82.9% | — |
| BigCodeBench Instruct | — | 33.9% |
| BigCodeBench Complete | — | 43.8% |
| ALE-Bench | 1,564 | — |

## Agentic & Tool Use

- Claude Opus 4.8: 47.6 (#11)
- Yi-1.5-34B: —

| Benchmark | Claude Opus 4.8 | Yi-1.5-34B |
|---|---|---|
| APEX-Agents | 48.9% | — |
| OSWorld 2.0 | 20.6% | — |
| Remote Labor Index | 8.3% | — |
| τ²-bench Banking | 39.7% | — |
| DeepResearch Bench | 50.2% | — |
| PostTrainBench | 33.8% | — |
| GBAEval | 70.9% | — |
| GDP.pdf | 24% | — |
| LMArena Search | 1204 | — |
| Vending-Bench 2 | 5,787 | — |

## Reasoning

- Claude Opus 4.8: 64.7 (#16)
- Yi-1.5-34B: 22.5 (#191)

| Benchmark | Claude Opus 4.8 | Yi-1.5-34B |
|---|---|---|
| LMArena Hard Prompts | 1482 | 1160 |
| ARC-AGI-2 | 72.1% | — |
| SimpleBench | 64.8% | — |
| Kagi LLM Benchmark | 88.8% | — |
| NYT Connections (extended) | 91.1% | — |
| ARC-AGI-1 | 92.5% | — |
| CritPt | 20.9% | — |
| Chess Puzzles | 34% | — |
| EnigmaEval | 23.5% | — |
| EBR-Bench | 28.6% | — |
| Mystery Game Puzzles | 36% | — |
| DTBench | 94.9% | — |
| LMCA | 57.5% | — |
| Surface Evolver Bench | 87.5% | — |
| Bench to the Future 3 | 0.14 | — |
| Epoch Capabilities Index | 158.21 | — |
| ForecastBench | 59.9 | — |

## Math

- Claude Opus 4.8: 78.4 (#13)
- Yi-1.5-34B: 27.5 (#249)

| Benchmark | Claude Opus 4.8 | Yi-1.5-34B |
|---|---|---|
| LMArena Math | 1487 | 1182 |
| FrontierMath (Tiers 1-3) | 80% | — |
| FrontierMath Tier 4 | 56.1% | — |
| MathArena Final-Answer Competitions | 91.8% | — |
| OTIS Mock AIME 2024-2025 | 98.3% | — |
| ProofBench | 69% | — |
| MATH Level 5 | — | 25.5% |
| FrontierMath (Feb 2025 set) | 47.2% | — |
| FrontierMath Tier 4 (v1) | 31.3% | — |

## Knowledge

- Claude Opus 4.8: 61.3 (#29)
- Yi-1.5-34B: 14.8 (#295)

| Benchmark | Claude Opus 4.8 | Yi-1.5-34B |
|---|---|---|
| GPQA Diamond | 91% | 32% |
| LMArena Expert | 1502 | 1144 |
| SimpleQA Verified | 53% | — |

## Multimodal

- Claude Opus 4.8: 42.9 (#26)
- Yi-1.5-34B: —

| Benchmark | Claude Opus 4.8 | Yi-1.5-34B |
|---|---|---|
| LMArena Vision | 1294 | — |
| Blueprint-Bench 2 | 14.5% | — |
| Furniture Assembly | 42.5% | — |
| LMArena Document | 1475 | — |

## Multilingual

- Claude Opus 4.8: 55.2 (#33)
- Yi-1.5-34B: 32.3 (#256)

| Benchmark | Claude Opus 4.8 | Yi-1.5-34B |
|---|---|---|
| LMArena Non-English | 1450 | 1121 |
| LMArena Chinese | 1507 | 1213 |
| LMArena French | 1481 | 1156 |
| LMArena German | 1472 | 1111 |
| LMArena Japanese | 1440 | 1021 |
| LMArena Korean | 1432 | 1005 |
| LMArena Russian | 1474 | 1091 |
| LMArena Spanish | 1466 | 1121 |

## Instruction Following

- Claude Opus 4.8: 77.4 (#24)
- Yi-1.5-34B: 59.2 (#257)

| Benchmark | Claude Opus 4.8 | Yi-1.5-34B |
|---|---|---|
| LMArena Instruction Following | 1476 | 1139 |

## Long Context

- Claude Opus 4.8: 45.4 (#35)
- Yi-1.5-34B: 34.6 (#248)

| Benchmark | Claude Opus 4.8 | Yi-1.5-34B |
|---|---|---|
| LMArena Longer Query | 1483 | 1143 |

## Writing & Preference

- Claude Opus 4.8: 72.0 (#16)
- Yi-1.5-34B: 37.4 (#257)

| Benchmark | Claude Opus 4.8 | Yi-1.5-34B |
|---|---|---|
| LMArena Text | 1461 | 1173 |
| LMArena Creative Writing | 1454 | 1135 |
| LMArena Multi-Turn | 1476 | 1153 |
| EQ-Bench Creative Writing | 1840 | — |
| EQ-Bench 4 | 1281 | — |

## FAQ

### Is Claude Opus 4.8 better than Yi-1.5-34B?

Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 30.6 on the Noometry Index.

### Is Claude Opus 4.8 or Yi-1.5-34B better for coding?

Claude Opus 4.8 scores higher on coding benchmarks: 59.9 versus 32.4 in the Noometry coding category.

### How many benchmarks do Claude Opus 4.8 and Yi-1.5-34B share?

18 benchmarks have published results for both models. Claude Opus 4.8 has 65 scored results on Noometry and Yi-1.5-34B has 21.