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....
Specifications
- Provider
- StepFun
- Type
- Open-source / open-weight
- Modality
- text->text
- Context window
- 262,144
- Released
- January 29, 2026
Capabilities
Input: textOutput: textReasoning required
Strengths
frequency_penaltyinclude_reasoningmax_tokensreasoningtemperaturetool_choicetoolstop_ktop_p
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