StepFun has released Step 5 Preview as open weights. FP8 and BF16 checkpoints are live on Hugging Face and ModelScope. Step 5 Preview is a sparse Mixture-of-Experts model from StepFun built for long-horizon agentic work…
Open-weights releases pressure closed pricing and widen access, changing the build-vs-buy math for the whole ecosystem.
Companies and models mentioned in this story — open their pages and live prices
Summaries are aggregated for information only — follow the source link for the full story. Demo entries are illustrative.