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AI · October 16, 2026

Step 5 Preview

600B open weights, trained for long-running agents

Step 5 Preview launched on October 16, 2026 with 79 votes, #267 of 3,394 launches that month and more than 95% of that year's launches.

Visit stepfun.com ↗Step 5 Preview alternativestop 8% of October 2026

What it does

Step 5 Preview is StepFun's open-weight MoE for coding, financial research and long-running agents. It has 600B total parameters, 27B active per token and a 1M-token context, with deployment support for vLLM, SGLang and Transformers.

阶跃星辰于2023年4月成立，以“智能阶跃，十倍每个人的可能”为使命。阶跃星辰坚定自研超级模型，积极布局算力、数据等关键资源，发挥算法和人才优势，已完成 Step-1 千亿参数语言大模型和 Step-1V 千亿多模态大模型的研发，在图像理解、多轮指令跟随、数学能力、逻辑推理、文本创作等方面性能达到业界领先水平。

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