StepFun’s License Has Three Conditions That Gate Deployment. “Open Weights” Just Got a Fine Print Problem.

The Terms Are Public. Now They Matter. The StepFun Model License 1.0 arrived on the HuggingFace repo October 15, 2026 – the same day the weights landed after their brief absence. The gap is closed. The slip is resolved. What is left is the document itself, and it is not what “open weights” usually means. Apache-style in structure, yes. OSI-approved? No. Three additional conditions sit between the download and the deploy, and each one gates a different kind of power. Three Conditions, Three Gates The license layers its restrictions by who you are and how big you are getting. Attribution at scale (Section 2b).

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