Model comparison
Claude 3.5 Sonnet vs Step 3.7 Flash
Step 3.7 Flash is the stronger model overall, scoring 37.3 to 34.6 on the Noometry Index.
Last verified . 0 shared benchmarks.
StepFunSummary
- The widest gap is in math, where Step 3.7 Flash leads 42.9 to 19.2.
- Step 3.7 Flash has downloadable open weights; the other is API-only.
Side by side
| Claude 3.5 Sonnet | Step 3.7 Flash | |
|---|---|---|
| Provider | Anthropic | StepFun |
| Noometry Index | 34.6 | 37.3 |
| Released | 2024-06-20 | 2026-05-29 |
| Weights | Proprietary | Open |
| Context window | — | 256K |
| Max output | — | 256K |
| Input $ / M tokens | — | $0.18 |
| Output $ / M tokens | — | $1.11 |
| Results tracked | 60 | 5 |
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Category by category
Coding Step 3.7 Flash leads
Claude 3.5 Sonnet: 39.0 (#165), Step 3.7 Flash: 40.0 (#150)
| Benchmark | Claude 3.5 Sonnet | Step 3.7 Flash |
|---|---|---|
| Aider Polyglot | 51.6% | — |
| SciCode | — | 40% |
| GSO | 4.6% | — |
| WeirdML | 40% | — |
| BigCodeBench Instruct | 46.8% | — |
| LiveBench Coding | 67.1% | — |
| LMArena Coding | 1342 | — |
| BigCodeBench Complete | 58.6% | — |
| CadEval | 48% | — |
| ALE-Bench | — | 694.12 |
| HumanEval+ | 81.7% | — |
| MBPP+ | 74.3% | — |
Agentic & Tool Use Not comparable
Claude 3.5 Sonnet: 32.3 (#67), Step 3.7 Flash: —
| Benchmark | Claude 3.5 Sonnet | Step 3.7 Flash |
|---|---|---|
| TheAgentCompany | 24% | — |
| Cybench | 17.5% | — |
| BALROG | 32.6% | — |
| METR Time Horizons | 45.2% | — |
Reasoning Claude 3.5 Sonnet leads
Claude 3.5 Sonnet: 23.1 (#183), Step 3.7 Flash: 21.6 (#219)
| Benchmark | Claude 3.5 Sonnet | Step 3.7 Flash |
|---|---|---|
| SimpleBench | 41.4% | — |
| NYT Connections (extended) | — | 39.7% |
| CritPt | — | 2.3% |
| EnigmaEval | 0.9% | — |
| LiveBench Reasoning | 56.7% | — |
| LMArena Hard Prompts | 1305 | — |
| DTBench | 67.8% | — |
| LiveBench Data Analysis | 55% | — |
| Epoch Capabilities Index | 133.55 | — |
| ForecastBench | 60.7 | — |
| LiveBench | 59% | — |
Math Step 3.7 Flash leads
Claude 3.5 Sonnet: 19.2 (#288), Step 3.7 Flash: 42.9 (#82)
| Benchmark | Claude 3.5 Sonnet | Step 3.7 Flash |
|---|---|---|
| MathArena Final-Answer Competitions | — | 68.5% |
| OTIS Mock AIME 2024-2025 | 8.5% | — |
| Omni-MATH | 27.6% | — |
| LiveBench Math | 52.3% | — |
| LMArena Math | 1307 | — |
| MATH Level 5 | 56.9% | — |
| FrontierMath (Feb 2025 set) | 2.1% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Not comparable
Claude 3.5 Sonnet: 28.6 (#245), Step 3.7 Flash: —
| Benchmark | Claude 3.5 Sonnet | Step 3.7 Flash |
|---|---|---|
| GPQA Diamond | 55.3% | — |
| Humanity's Last Exam | 4.1% | — |
| MMLU-Pro | 77.7% | — |
| Confabulations | 19.9% | — |
| GPQA (HELM) | 56.5% | — |
| LMArena Expert | 1265 | — |
| MMLU | 87.3% | — |
Multimodal Not comparable
Claude 3.5 Sonnet: 26.5 (#120), Step 3.7 Flash: —
| Benchmark | Claude 3.5 Sonnet | Step 3.7 Flash |
|---|---|---|
| LMArena Vision | 1125 | — |
| Video-MME | 60% | — |
| GeoBench | 62% | — |
| VPCT | 33% | — |
Multilingual Not comparable
Claude 3.5 Sonnet: 43.2 (#185), Step 3.7 Flash: —
| Benchmark | Claude 3.5 Sonnet | Step 3.7 Flash |
|---|---|---|
| LMArena Non-English | 1283 | — |
| LMArena Chinese | 1272 | — |
| LMArena French | 1305 | — |
| LMArena German | 1297 | — |
| LMArena Japanese | 1234 | — |
| LMArena Korean | 1200 | — |
| LMArena Russian | 1306 | — |
| LMArena Spanish | 1290 | — |
Instruction Following Not comparable
Claude 3.5 Sonnet: 68.8 (#182), Step 3.7 Flash: —
| Benchmark | Claude 3.5 Sonnet | Step 3.7 Flash |
|---|---|---|
| LiveBench Instruction Following | 69.3% | — |
| IFEval | 85.5% | — |
| LMArena Instruction Following | 1297 | — |
Long Context Not comparable
Claude 3.5 Sonnet: 39.9 (#167), Step 3.7 Flash: —
| Benchmark | Claude 3.5 Sonnet | Step 3.7 Flash |
|---|---|---|
| LMArena Longer Query | 1311 | — |
Writing & Preference Not comparable
Claude 3.5 Sonnet: 52.9 (#164), Step 3.7 Flash: —
| Benchmark | Claude 3.5 Sonnet | Step 3.7 Flash |
|---|---|---|
| LMArena Text | 1298 | — |
| LMArena Creative Writing | 1292 | — |
| Short-Story Creative Writing | 80.3% | — |
| EQ-Bench Creative Writing | 1451 | — |
| WildBench | 79.2% | — |
| LMArena Multi-Turn | 1326 | — |
| LiveBench Language | 53.8% | — |
Frequently asked questions
Is Claude 3.5 Sonnet better than Step 3.7 Flash?
Step 3.7 Flash is the stronger model overall, scoring 37.3 to 34.6 on the Noometry Index.
Is Claude 3.5 Sonnet or Step 3.7 Flash better for coding?
Step 3.7 Flash scores higher on coding benchmarks: 40.0 versus 39.0 in the Noometry coding category.
How many benchmarks do Claude 3.5 Sonnet and Step 3.7 Flash share?
0 benchmarks have published results for both models. Claude 3.5 Sonnet has 60 scored results on Noometry and Step 3.7 Flash has 5.