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Step 3.5 Flash

LLMby StepFun·Model page

StepFun's fast reasoning LLM with a 262K-token context for text generation and analysis.

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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....

Author
S
StepFun
Organization
stepfun
Details
Downloads
Likes
AccessOpen Source
Context262K tokens
Input price$0.09 /1M
Output price$0.3 /1M
CreatedJan 29, 2026
Updated
View on Hugging Face
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Step 3.5 Flash — AI Model Details | Applied