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Open weights for StepFun’s 600B model are reportedly planned for October 15
A user describes a mixture-of-experts model with 27 billion active parameters, vision and a 1M context window, designed for coding, 3D and web design.
TLDR
A user writing on September 21 describes StepFun’s model as having 600 billion total parameters, with 27 billion active, and says open weights are planned for October 15, 2026. The user says ArtificialAnalysis puts it on par with Kimi K3 in intelligence. They also describe it as designed to be relatively inexpensive compared with its direct competitors—not as an established price advantage.
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