StepFun: Step 3.5 Flash
StepfunStep 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) archit
Ultra-low cost
Text
Specifications
| Vendor | Stepfun |
| Family | stepfun |
| Context | 262.1K · 196.6k words（≈ a novella） |
| Max output | 262.1K · 196.6k words（≈ a novella） |
| Released | 2026-06-19 |
| Open source | No |
| Tool use | — |
Pricing across channels
per 1M tokens, USD
| Channel | Type | Input | Output | → |
|---|---|---|---|---|
| OpenRouter (auto) | Aggregator | $0.090 | $0.30 | visitAd |
OpenRouter API (auto-fetched)· 2026-06-19
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