Model comparison
Claude 2 vs Step 3.5 Flash
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 25.0 on the Noometry Index.
Last verified . 0 shared benchmarks.
StepFunSummary
- The widest gap is in math, where Step 3.5 Flash leads 42.6 to 9.3.
- Step 3.5 Flash has downloadable open weights; the other is API-only.
Side by side
| Claude 2 | Step 3.5 Flash | |
|---|---|---|
| Provider | Anthropic | StepFun |
| Noometry Index | 25.0 | 42.3 |
| Released | 2023-07-11 | 2026-01-29 |
| Weights | Proprietary | Open |
| Context window | — | 256K |
| Max output | — | 256K |
| Input $ / M tokens | — | $0.10 |
| Output $ / M tokens | — | $0.30 |
| Results tracked | 8 | 19 |
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Category by category
Coding Not comparable
Claude 2: —, Step 3.5 Flash: 42.4 (#105)
| Benchmark | Claude 2 | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | — | 1436 |
| HumanEval+ | 61.6% | — |
Reasoning Too close to call
Claude 2: 21.7 (#216), Step 3.5 Flash: 22.2 (#202)
| Benchmark | Claude 2 | Step 3.5 Flash |
|---|---|---|
| NYT Connections (extended) | — | 28.4% |
| LMArena Hard Prompts | — | 1411 |
| DTBench | 51.9% | — |
| Epoch Capabilities Index | 120.13 | — |
Math Step 3.5 Flash leads
Claude 2: 9.3 (#320), Step 3.5 Flash: 42.6 (#84)
| Benchmark | Claude 2 | Step 3.5 Flash |
|---|---|---|
| MathArena Final-Answer Competitions | — | 66.8% |
| OTIS Mock AIME 2024-2025 | 2.5% | — |
| LMArena Math | — | 1408 |
| MATH Level 5 | 11.7% | — |
Knowledge Step 3.5 Flash leads
Claude 2: 16.9 (#287), Step 3.5 Flash: 39.6 (#132)
| Benchmark | Claude 2 | Step 3.5 Flash |
|---|---|---|
| GPQA Diamond | 34.7% | — |
| LMArena Expert | — | 1421 |
| MMLU | 78.5% | — |
| TriviaQA | 87.5% | — |
Multilingual Not comparable
Claude 2: —, Step 3.5 Flash: 50.5 (#119)
| Benchmark | Claude 2 | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | — | 1385 |
| LMArena Chinese | — | 1447 |
| LMArena French | — | 1421 |
| LMArena German | — | 1405 |
| LMArena Japanese | — | 1354 |
| LMArena Korean | — | 1352 |
| LMArena Russian | — | 1385 |
| LMArena Spanish | — | 1419 |
Instruction Following Not comparable
Claude 2: —, Step 3.5 Flash: 73.1 (#124)
| Benchmark | Claude 2 | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | — | 1385 |
Long Context Not comparable
Claude 2: —, Step 3.5 Flash: 42.8 (#117)
| Benchmark | Claude 2 | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | — | 1402 |
Writing & Preference Not comparable
Claude 2: —, Step 3.5 Flash: 58.8 (#113)
| Benchmark | Claude 2 | Step 3.5 Flash |
|---|---|---|
| LMArena Text | — | 1403 |
| LMArena Creative Writing | — | 1357 |
| LMArena Multi-Turn | — | 1405 |
Frequently asked questions
Is Claude 2 better than Step 3.5 Flash?
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 25.0 on the Noometry Index.
How many benchmarks do Claude 2 and Step 3.5 Flash share?
0 benchmarks have published results for both models. Claude 2 has 8 scored results on Noometry and Step 3.5 Flash has 19.