StepFun Releases Full SFT Dataset Used to Train Step 3.5 Flash — Rare Training Data Transparency

r/LocalLLaMA·low signal

StepFun published the supervised fine-tuning dataset used to train Step 3.5 Flash on Hugging Face, providing a complete look at the instruction data behind a production-grade model. This is notable because frontier model SFT datasets are almost never released; practitioners can use this for fine-tuning experiments and dataset quality analysis. The post (196 upvotes) confirms the dataset is publicly accessible without license restrictions.