{"id":"stepfun/step-3.5-flash","name":"Step 3.5 Flash","owned_by":"stepfun","description":"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....","context_window":262144,"max_tokens":65536,"type":"language","tags":["reasoning","tool-use"],"released":1769728337,"modalities":{"input":["text"],"output":["text"]},"supported_parameters":["frequency_penalty","include_reasoning","max_tokens","reasoning","temperature","tool_choice","tools","top_k","top_p"],"pricing":{"input":"0.0000001","output":"0.0000003"},"legal":[]}