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Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token. It is a reasoning model that is incredibly speed efficient even at long contexts.
| Signal | Strength | Weight | Impact |
|---|---|---|---|
| Capabilitiesjust now | 50 | 30% | +15.0 |
| Recencyjust now | 100 | 15% | +15.0 |
| Output Capacityjust now | 90 | 15% | +13.5 |
| Context Windowjust now | 86 | 15% | +12.9 |
| Pricingjust now | 30 | 25% | +7.5 |
Community and practitioner feedback adds real-world signal on top of benchmarks and pricing.
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