阶跃星辰 Step 5 Preview 现身 OpenRouter，1M 上下文 MoE 模型
Step 5 Preview, a 1M-context MoE from StepFun, shows up on OpenRouter
阶跃星辰的 Step 5 Preview 已在 OpenRouter 上线，这是一款 1M 上下文的 MoE 模型。该系列此前的 Step 3.7 Flash 采用 196B 参数语言主干加视觉编码器，每 token 激活约 11B 参数，支持 256K 上下文和 high/medium/low 可选推理等级，面向编程、智能体工作流与结构化输出。
Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model. It pairs a 196B-parameter language backbone with a vision encoder for native image and video understanding, activating roughly 11B parameters per token. The model supports a 256K context window and exposes selectable reasoning levels (high/medium/low), letting callers trade off speed, cost, and depth of reasoning.
Designed for coding, agentic workflows, structured outputs, and long-context productivity tasks.
来源：Hacker News：AI 热帖 · openrouter.ai