Step 5 Preview is StepFun’s 600‑B parameter open‑weight MoE model for coding, finance, and long‑running agents. It activates 27 B parameters per token, supports a 1 M‑token context, and deploys via vLLM, SGLang, and Transformers. This expands accessible large‑model capabilities for developers needing high‑capacity, low‑latency inference.
Opening Kapyn…