# Claude 3 Sonnet vs Step 5 Preview

> Step 5 Preview is the stronger model overall, scoring 43.8 to 28.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-sonnet-vs-step-5-preview
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where Step 5 Preview leads 50.6 to 29.2.

## Snapshot

| | Claude 3 Sonnet | Step 5 Preview |
|---|---|---|
| Provider | Anthropic | StepFun |
| Noometry Index | 28.8 | 43.8 |
| Rank | 311 | 78 |
| Context | — | 1.02M |
| Input $/M | — | $1 |
| Output $/M | — | $2.70 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude 3 Sonnet: 29.2 (#296)
- Step 5 Preview: 50.6 (#40)

| Benchmark | Claude 3 Sonnet | Step 5 Preview |
|---|---|---|
| LMArena WebDev | — | 1569 |
| SciCode | — | 58.9% |
| WeirdML | 10.2% | — |
| BigCodeBench Instruct | 42.7% | — |
| LMArena Coding | 1223 | — |
| BigCodeBench Complete | 53.8% | — |
| HumanEval+ | 64% | — |
| MBPP+ | 69.3% | — |

## Reasoning

- Claude 3 Sonnet: 19.7 (#232)
- Step 5 Preview: 38.0 (#58)

| Benchmark | Claude 3 Sonnet | Step 5 Preview |
|---|---|---|
| CritPt | — | 20.9% |
| LMArena Hard Prompts | 1197 | — |
| DTBench | 53.6% | — |
| Epoch Capabilities Index | 120.69 | — |
| WinoGrande | 75.1% | — |

## Math

- Claude 3 Sonnet: 10.0 (#305)
- Step 5 Preview: —

| Benchmark | Claude 3 Sonnet | Step 5 Preview |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | — |
| LMArena Math | 1213 | — |
| MATH Level 5 | 18.2% | — |

## Knowledge

- Claude 3 Sonnet: 21.1 (#271)
- Step 5 Preview: —

| Benchmark | Claude 3 Sonnet | Step 5 Preview |
|---|---|---|
| GPQA Diamond | 40.6% | — |
| LMArena Expert | 1173 | — |
| MMLU | 75.9% | — |

## Multimodal

- Claude 3 Sonnet: 24.7 (#120)
- Step 5 Preview: —

| Benchmark | Claude 3 Sonnet | Step 5 Preview |
|---|---|---|
| LMArena Vision | 984 | — |

## Multilingual

- Claude 3 Sonnet: 38.0 (#229)
- Step 5 Preview: —

| Benchmark | Claude 3 Sonnet | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1205 | — |
| LMArena Chinese | 1188 | — |
| LMArena French | 1228 | — |
| LMArena German | 1204 | — |
| LMArena Japanese | 1131 | — |
| LMArena Korean | 1128 | — |
| LMArena Russian | 1227 | — |
| LMArena Spanish | 1204 | — |

## Instruction Following

- Claude 3 Sonnet: 63.1 (#230)
- Step 5 Preview: —

| Benchmark | Claude 3 Sonnet | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1200 | — |

## Long Context

- Claude 3 Sonnet: 36.7 (#223)
- Step 5 Preview: —

| Benchmark | Claude 3 Sonnet | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1211 | — |

## Writing & Preference

- Claude 3 Sonnet: 42.3 (#233)
- Step 5 Preview: —

| Benchmark | Claude 3 Sonnet | Step 5 Preview |
|---|---|---|
| LMArena Text | 1218 | — |
| LMArena Creative Writing | 1186 | — |
| LMArena Multi-Turn | 1227 | — |

## FAQ

### Is Claude 3 Sonnet better than Step 5 Preview?

Step 5 Preview is the stronger model overall, scoring 43.8 to 28.8 on the Noometry Index.

### Is Claude 3 Sonnet or Step 5 Preview better for coding?

Step 5 Preview scores higher on coding benchmarks: 50.6 versus 29.2 in the Noometry coding category.

### How many benchmarks do Claude 3 Sonnet and Step 5 Preview share?

0 benchmarks have published results for both models. Claude 3 Sonnet has 30 scored results on Noometry and Step 5 Preview has 3.