ACC 2026

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   StepFun details Step 5 Preview and Step Code at ACC 2026

   At ACC 2026, StepFun GTM and developer relations lead Gong Guan detailed the company’s Step 5 Preview flagship foundation model and Step Code Agent Harness. Step 5 Preview uses a 600B-parameter MoE architecture with about 27B parameters activated per inference, native multimodal input, long-context processing, and tool use, while Step Code manages goals, context, execution state, and result acceptance for long-running tasks. Gong Guan said Step Code was then in its fourth version, with an average iteration cycle of three working days.

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