阶跃新旗舰 Step 5 Preview 发布，跻身 AA 榜单全球开源前三

TL;DR - StepFun announced Step 5 Preview, a multimodal sparse-MoE foundation model targeting agentic software engineering, professional, and financial workflows. It ranks among the top three open models on Artificial Analysis’s Intelligence Index and is scheduled for open-source release on October 15.

• Uses 600B total parameters with 27B active parameters per inference and supports a 1-million-token context window.
• Natively accepts text and visual inputs, with an emphasis on complex agent tasks and long-horizon planning.
• StepFun reports a per-task cost one-eighth that of Claude Opus 5, positioning efficiency as a key advantage.
• Public and internal evaluations reportedly show strong performance in software engineering, professional knowledge work, and finance.