StepFun Releases Open Weights for Step 5 Preview, Publishes Technical Blog on Its Architecture

T2Covered by 1 source · first reported by China: SCMP Tech / TechNode / Pandaily / KrASIA / Sixth Tone at 15 Oct, 09:42 UTC

Open weights for StepFun's Step 5 Preview are live: 600B total, 27B active, 1M context. A new technical blog explains its 92-layer design, Sparse GQA and long-horizon agent training.