Event ·Official first-hand

StepFun 开源 Step 5 Preview：600B 参数 MoE，100 万上下文

StepFun 发布 Step 5 Preview 开放权重模型，检查点已上线 Hugging Face 和 ModelScope，提供 FP8 和 BF16 两种格式。该模型采用稀疏 Mixture-of-Experts 架构，总参数 600B，每个 token 激活 27B。上下文窗口最高支持 1M tokens，面向长程智能体任务设计。

Current read

StepFun 把 Step 5 Preview 的权重直接开源了，600B 的 MoE 模型每次只激活 27B，还能塞 100 万 token 上下文，Hugging Face 上就能下载。

4 sources68° AI heatLast updated 2026/10/17 06:29:55

Evidence

4 sources

Primary sourcemarktechpost

2026/10/17 06:29:55View source

Related source 1阶跃星辰 Stepfun

2026/10/15 13:00:01View source

Related source 2NVIDIA AI

2026/10/15 13:52:20View source

Related source 3lmarena.ai

2026/10/17 15:25:01View source

Conflict check

Dedup data only shows that these sources discuss the same event, not that they agree. There is no structured supporting or refuting evidence yet, so no conflict is inferred automatically.

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