Back to all models
stepfun
stepfunStepFun: Step 3.5 Flash
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....
stepfun/step-3.5-flash
Context Size
262.144K
Input Price
13,500 pts/M
Output Price
45,000 pts/M
Architecture
Text
Supported Parameters
frequency_penaltyinclude_reasoninglogit_biasmax_tokensmin_ppresence_penaltyreasoningrepetition_penaltyresponse_formatseedstoptemperaturetool_choicetoolstop_ktop_p
Details
TokenizerOther
Max Completion16,384 tokens
Provider Context262.144K tokens
ModeratedNo
CreatedJan 29, 2026