# Claude 3.5 Sonnet vs Claude Opus 4.8

> Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 34.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-5-sonnet-vs-claude-opus-4-8
- Last updated: 2026-10-10
- Shared benchmarks: 30

## Summary

- They share 30 benchmarks with published results for both. Claude 3.5 Sonnet scores higher in 0 categories and Claude Opus 4.8 in 10 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 4.8 leads 78.4 to 19.2.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 8.5% for Claude 3.5 Sonnet and 98.3% for Claude Opus 4.8.

## Snapshot

| | Claude 3.5 Sonnet | Claude Opus 4.8 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 34.6 | 60.7 |
| Rank | 231 | 13 |
| Context | — | 1M |
| Input $/M | — | $5 |
| Output $/M | — | $25 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude 3.5 Sonnet: 39.0 (#165)
- Claude Opus 4.8: 59.9 (#12)

| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.8 |
|---|---|---|
| GSO | 4.6% | 47.1% |
| WeirdML | 40% | 82.9% |
| LMArena Coding | 1342 | 1490 |
| DeepSWE | — | 59% |
| FrontierCode | — | 46.5% |
| Aider Polyglot | 51.6% | — |
| LMArena WebDev | — | 1556 |
| SciCode | — | 53.5% |
| BigCodeBench Instruct | 46.8% | — |
| LiveBench Coding | 67.1% | — |
| BigCodeBench Complete | 58.6% | — |
| CadEval | 48% | — |
| ALE-Bench | — | 1,564 |
| HumanEval+ | 81.7% | — |
| MBPP+ | 74.3% | — |

## Agentic & Tool Use

- Claude 3.5 Sonnet: 32.3 (#67)
- Claude Opus 4.8: 47.6 (#11)

| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.8 |
|---|---|---|
| APEX-Agents | — | 48.9% |
| OSWorld 2.0 | — | 20.6% |
| Remote Labor Index | — | 8.3% |
| TheAgentCompany | 24% | — |
| τ²-bench Banking | — | 39.7% |
| Cybench | 17.5% | — |
| DeepResearch Bench | — | 50.2% |
| PostTrainBench | — | 33.8% |
| BALROG | 32.6% | — |
| GBAEval | — | 70.9% |
| GDP.pdf | — | 24% |
| LMArena Search | — | 1204 |
| METR Time Horizons | 45.2% | — |
| Vending-Bench 2 | — | 5,787 |

## Reasoning

- Claude 3.5 Sonnet: 23.1 (#183)
- Claude Opus 4.8: 64.7 (#16)

| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.8 |
|---|---|---|
| SimpleBench | 41.4% | 64.8% |
| EnigmaEval | 0.9% | 23.5% |
| LMArena Hard Prompts | 1305 | 1482 |
| DTBench | 67.8% | 94.9% |
| Epoch Capabilities Index | 133.55 | 158.21 |
| ForecastBench | 60.7 | 59.9 |
| ARC-AGI-2 | — | 72.1% |
| Kagi LLM Benchmark | — | 88.8% |
| NYT Connections (extended) | — | 91.1% |
| ARC-AGI-1 | — | 92.5% |
| CritPt | — | 20.9% |
| Chess Puzzles | — | 34% |
| EBR-Bench | — | 28.6% |
| LiveBench Reasoning | 56.7% | — |
| Mystery Game Puzzles | — | 36% |
| LiveBench Data Analysis | 55% | — |
| LMCA | — | 57.5% |
| Surface Evolver Bench | — | 87.5% |
| Bench to the Future 3 | — | 0.14 |
| LiveBench | 59% | — |

## Math

- Claude 3.5 Sonnet: 19.2 (#288)
- Claude Opus 4.8: 78.4 (#13)

| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.8 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 8.5% | 98.3% |
| LMArena Math | 1307 | 1487 |
| FrontierMath (Feb 2025 set) | 2.1% | 47.2% |
| FrontierMath Tier 4 (v1) | 0% | 31.3% |
| FrontierMath (Tiers 1-3) | — | 80% |
| FrontierMath Tier 4 | — | 56.1% |
| MathArena Final-Answer Competitions | — | 91.8% |
| ProofBench | — | 69% |
| Omni-MATH | 27.6% | — |
| LiveBench Math | 52.3% | — |
| MATH Level 5 | 56.9% | — |

## Knowledge

- Claude 3.5 Sonnet: 28.6 (#245)
- Claude Opus 4.8: 61.3 (#29)

| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.8 |
|---|---|---|
| GPQA Diamond | 55.3% | 91% |
| LMArena Expert | 1265 | 1502 |
| Humanity's Last Exam | 4.1% | — |
| SimpleQA Verified | — | 53% |
| MMLU-Pro | 77.7% | — |
| Confabulations | 19.9% | — |
| GPQA (HELM) | 56.5% | — |
| MMLU | 87.3% | — |

## Multimodal

- Claude 3.5 Sonnet: 26.5 (#120)
- Claude Opus 4.8: 42.9 (#26)

| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.8 |
|---|---|---|
| LMArena Vision | 1125 | 1294 |
| Video-MME | 60% | — |
| GeoBench | 62% | — |
| VPCT | 33% | — |
| Blueprint-Bench 2 | — | 14.5% |
| Furniture Assembly | — | 42.5% |
| LMArena Document | — | 1475 |

## Multilingual

- Claude 3.5 Sonnet: 43.2 (#185)
- Claude Opus 4.8: 55.2 (#33)

| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.8 |
|---|---|---|
| LMArena Non-English | 1283 | 1450 |
| LMArena Chinese | 1272 | 1507 |
| LMArena French | 1305 | 1481 |
| LMArena German | 1297 | 1472 |
| LMArena Japanese | 1234 | 1440 |
| LMArena Korean | 1200 | 1432 |
| LMArena Russian | 1306 | 1474 |
| LMArena Spanish | 1290 | 1466 |

## Instruction Following

- Claude 3.5 Sonnet: 68.8 (#182)
- Claude Opus 4.8: 77.4 (#24)

| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.8 |
|---|---|---|
| LMArena Instruction Following | 1297 | 1476 |
| LiveBench Instruction Following | 69.3% | — |
| IFEval | 85.5% | — |

## Long Context

- Claude 3.5 Sonnet: 39.9 (#167)
- Claude Opus 4.8: 45.4 (#35)

| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.8 |
|---|---|---|
| LMArena Longer Query | 1311 | 1483 |

## Writing & Preference

- Claude 3.5 Sonnet: 52.9 (#164)
- Claude Opus 4.8: 72.0 (#16)

| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.8 |
|---|---|---|
| LMArena Text | 1298 | 1461 |
| LMArena Creative Writing | 1292 | 1454 |
| EQ-Bench Creative Writing | 1451 | 1840 |
| LMArena Multi-Turn | 1326 | 1476 |
| Short-Story Creative Writing | 80.3% | — |
| WildBench | 79.2% | — |
| EQ-Bench 4 | — | 1281 |
| LiveBench Language | 53.8% | — |

## FAQ

### Is Claude 3.5 Sonnet better than Claude Opus 4.8?

Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 34.6 on the Noometry Index.

### Is Claude 3.5 Sonnet or Claude Opus 4.8 better for coding?

Claude Opus 4.8 scores higher on coding benchmarks: 59.9 versus 39.0 in the Noometry coding category.

### How many benchmarks do Claude 3.5 Sonnet and Claude Opus 4.8 share?

30 benchmarks have published results for both models. Claude 3.5 Sonnet has 60 scored results on Noometry and Claude Opus 4.8 has 65.