A 600B-total, 27B-active multimodal preview with hosted access and weights under StepFun Model License 1.0. Hosted docs specify 1M context and 64k maximum output; the model card's output ceiling has separate runtime conditions.
Test configuration: Effort not named in source table
Source read · · v4.3.2
Each model uses its highest tested setting, with fallback conditions retained. Original K3 remains at max44 from its readable individual page; the aggregate page now lists K3.1 Pro separately. Scores use one evaluator. The index mainly evaluates English text tasks; examine Chinese and image capabilities separately.
The technical account describes a 92-layer architecture, long context and agent training; this date establishes the account, rather than the model's first launch or first weights release.