Model comparison
Claude 3.5 Sonnet vs Step 5 Preview
Step 5 Preview is the stronger model overall, scoring 47.9 to 34.6 on the Noometry Index.
Last verified . 14 shared benchmarks.
StepFunSummary
- They share 14 benchmarks with published results for both. Claude 3.5 Sonnet scores higher in 0 categories and Step 5 Preview in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Step 5 Preview leads 46.1 to 19.2.
Side by side
| Claude 3.5 Sonnet | Step 5 Preview | |
|---|---|---|
| Provider | Anthropic | StepFun |
| Noometry Index | 34.6 | 47.9 |
| Released | 2024-06-20 | 2026-09-16 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.02M |
| Max output | — | 66K |
| Input $ / M tokens | — | $1 |
| Output $ / M tokens | — | $2.70 |
| Results tracked | 60 | 18 |
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Category by category
Coding Step 5 Preview leads
Claude 3.5 Sonnet: 39.0 (#165), Step 5 Preview: 51.8 (#36)
| Benchmark | Claude 3.5 Sonnet | Step 5 Preview |
|---|---|---|
| LMArena Coding | 1342 | 1480 |
| Aider Polyglot | 51.6% | — |
| LMArena WebDev | — | 1564 |
| SciCode | — | 58.9% |
| GSO | 4.6% | — |
| WeirdML | 40% | — |
| BigCodeBench Instruct | 46.8% | — |
| LiveBench Coding | 67.1% | — |
| BigCodeBench Complete | 58.6% | — |
| CadEval | 48% | — |
| HumanEval+ | 81.7% | — |
| MBPP+ | 74.3% | — |
Agentic & Tool Use Not comparable
Claude 3.5 Sonnet: 32.3 (#67), Step 5 Preview: —
| Benchmark | Claude 3.5 Sonnet | Step 5 Preview |
|---|---|---|
| TheAgentCompany | 24% | — |
| Cybench | 17.5% | — |
| BALROG | 32.6% | — |
| METR Time Horizons | 45.2% | — |
Reasoning Step 5 Preview leads
Claude 3.5 Sonnet: 23.1 (#183), Step 5 Preview: 40.0 (#57)
| Benchmark | Claude 3.5 Sonnet | Step 5 Preview |
|---|---|---|
| LMArena Hard Prompts | 1305 | 1465 |
| SimpleBench | 41.4% | — |
| CritPt | — | 20.9% |
| EnigmaEval | 0.9% | — |
| LiveBench Reasoning | 56.7% | — |
| DTBench | 67.8% | — |
| LiveBench Data Analysis | 55% | — |
| Epoch Capabilities Index | 133.55 | — |
| ForecastBench | 60.7 | — |
| LiveBench | 59% | — |
Math Step 5 Preview leads
Claude 3.5 Sonnet: 19.2 (#288), Step 5 Preview: 46.1 (#72)
| Benchmark | Claude 3.5 Sonnet | Step 5 Preview |
|---|---|---|
| LMArena Math | 1307 | 1470 |
| OTIS Mock AIME 2024-2025 | 8.5% | — |
| ProofBench | — | 42% |
| Omni-MATH | 27.6% | — |
| LiveBench Math | 52.3% | — |
| MATH Level 5 | 56.9% | — |
| FrontierMath (Feb 2025 set) | 2.1% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Step 5 Preview leads
Claude 3.5 Sonnet: 28.6 (#245), Step 5 Preview: 41.2 (#112)
| Benchmark | Claude 3.5 Sonnet | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1265 | 1470 |
| GPQA Diamond | 55.3% | — |
| Humanity's Last Exam | 4.1% | — |
| MMLU-Pro | 77.7% | — |
| Confabulations | 19.9% | — |
| GPQA (HELM) | 56.5% | — |
| MMLU | 87.3% | — |
Multimodal Step 5 Preview leads
Claude 3.5 Sonnet: 26.5 (#120), Step 5 Preview: 41.0 (#41)
| Benchmark | Claude 3.5 Sonnet | Step 5 Preview |
|---|---|---|
| LMArena Vision | 1125 | 1267 |
| Video-MME | 60% | — |
| GeoBench | 62% | — |
| VPCT | 33% | — |
Multilingual Step 5 Preview leads
Claude 3.5 Sonnet: 43.2 (#185), Step 5 Preview: 53.8 (#54)
| Benchmark | Claude 3.5 Sonnet | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1283 | 1432 |
| LMArena Chinese | 1272 | 1519 |
| LMArena Russian | 1306 | 1436 |
| LMArena Spanish | 1290 | 1439 |
| LMArena French | 1305 | — |
| LMArena German | 1297 | — |
| LMArena Japanese | 1234 | — |
| LMArena Korean | 1200 | — |
Instruction Following Step 5 Preview leads
Claude 3.5 Sonnet: 68.8 (#182), Step 5 Preview: 76.0 (#50)
| Benchmark | Claude 3.5 Sonnet | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1297 | 1444 |
| LiveBench Instruction Following | 69.3% | — |
| IFEval | 85.5% | — |
Long Context Step 5 Preview leads
Claude 3.5 Sonnet: 39.9 (#167), Step 5 Preview: 44.5 (#64)
| Benchmark | Claude 3.5 Sonnet | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1311 | 1455 |
Writing & Preference Step 5 Preview leads
Claude 3.5 Sonnet: 52.9 (#164), Step 5 Preview: 62.8 (#71)
| Benchmark | Claude 3.5 Sonnet | Step 5 Preview |
|---|---|---|
| LMArena Text | 1298 | 1442 |
| LMArena Creative Writing | 1292 | 1410 |
| LMArena Multi-Turn | 1326 | 1447 |
| Short-Story Creative Writing | 80.3% | — |
| EQ-Bench Creative Writing | 1451 | — |
| WildBench | 79.2% | — |
| LiveBench Language | 53.8% | — |
Frequently asked questions
Is Claude 3.5 Sonnet better than Step 5 Preview?
Step 5 Preview is the stronger model overall, scoring 47.9 to 34.6 on the Noometry Index.
Is Claude 3.5 Sonnet or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 51.8 versus 39.0 in the Noometry coding category.
How many benchmarks do Claude 3.5 Sonnet and Step 5 Preview share?
14 benchmarks have published results for both models. Claude 3.5 Sonnet has 60 scored results on Noometry and Step 5 Preview has 18.