Step-5 BF16 Open Weights Miss Their Own Date. The Vendor-Promise Class Just Produced Its First Exhibit.

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…