{ "id": "step-3.5-199b", "created_at": "2026-02-20T08:54:25.529Z", "updated_at": "2026-06-09T17:10:13.246Z", "concurrency_cost": 4, "size": 199, "parameter_size": 199000000000, "context_length": 262144, "is_moe": false, "active_parameters": 11, "vision_supported": false, "input_modalities": [ "text" ], "output_modalities": [ "text" ], "family": "step35", "family_name": "Step 3.5" }

stepfun-ai/Step-3.5-Flash