StepFun: Step 3.5 Flash reasoning
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. It is a reasoning model that is incredibly speed efficient even at long contexts.
Context Inputs Outputs Input Price Cache Read Price Cache Write Price Output Price256k0.100.02 -0.30
StepFun: Step 3.5 Flash (free) reasoningStep 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. It is a reasoning model that is incredibly speed efficient even at long contexts.
Context Inputs Outputs Input Price Cache Read Price Cache Write Price Output Price256k-- --