Four Open-Weight Models Shipped in 24 Hours. They Defined Three Different Kinds of ‘Open.’

The Date Arrived. The Weights Did Not. On September 20, StepFun committed to releasing the BF16 open weights for its Step-5 model on October 15, 2026. That date has now passed. As of 01:55Z on October 15, the expected HuggingFace…