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阶跃星辰发布 Step5Preview：单任务成本仅为 Claude Opus5 的 1/8
阶跃星辰发布下一代旗舰基座模型 Step5Preview，聚焦 AI 编程、软件工程、专业工作和金融等 Agentic 场景。该模型采用稀疏 MoE 架构，总参数 600B、激活参数 27B，支持 100 万 Token 上下文并原生支持文本与视觉输入。文中称其在 Artificial Analysis 综合智能指数中进入全球开源模型前三，单任务成本仅为 Claude Opus5 的 1/8，计划于 10 月 15 日正式开源。上述性能与成本对比为转述数据，缺乏可验证的评测细节。
AI推荐理由 阶跃星辰（StepZen）发布下一代旗舰基座模型 Step5Preview，采用稀疏 MoE 架构，总参数 600B、激活参数 27B，支持 100 万 Token 上下文并原生支持文本与视觉输入，面向 AI 编程、软件工程、专业工作流和金融等 Agentic 场景。文中称其在 Artificial Analysis 综合智能指数中位列全球开源模型前三，单任务成本仅为 Claude Opus5 的 1/8，并计划于 10 月 15 日正式开源。这些性能与成本对比来自转述，未提供可验证的评测细节，需谨慎看待；但模型架构、参数规模和开源计划属于具体可核验的新信息，对开发者和开源模型生态有参考价值。
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StepZen Launches Step5Preview, with a Single Task Cost of Only 1/8 of Claude Opus5
AIbase基地
Published inAI News · 2 min read · Sep 20, 2026
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Step Zenith released the next-generation flagship base model Step5Preview, focusing on scenarios such as AI programming, software engineering, professional work, and finance, enhancing the model's overall performance in real-world Agentic tasks and further optimizing the balance between intelligence, cost, and efficiency.
This model ranks in the top three of global open-source models in the Artificial Analysis Intelligence Index (AA Comprehensive Intelligence Index), with a single-task cost only 1/8 of Claude Opus5. It is planned to be officially open-sourced on October 15.
In terms of architecture, Step5Preview uses a sparse MoE architecture, with a total parameter count of 600B, and only 27B activated parameters. It supports a 1 million Token context window and natively supports text and visual input. It has been optimized for complex tasks in scenarios such as software engineering, professional workflows, and finance.
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