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StepFun: Step 3.5 Flash
stepfun/step-3.5-flash
Tool useJSONReasoningStreaming
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....
Pricing
Input
$0.09 / 1M
Output
$0.3 / 1M
Specs
Context
262,144 tokens
Input
text
Output
text
Released: 2026-01
Supported parameters
frequency_penaltyinclude_reasoninglogit_biasmax_tokensmin_ppresence_penaltyreasoningrepetition_penaltyresponse_formatseedstoptemperaturetool_choicetoolstop_ktop_p
Open weights · HuggingFace
333,078 downloads/mo
819 likes
apache-2.0 text-generation