StepFun(@StepFun_ai):Introducing Step 5 Preview: Advancing the Pareto Frontier. Step 5 Preview is our new flagship model for agentic work, delivering frontier-level performance across software engineering and professional knowledge work, with particular strength in finance. - 600B total / 27B active MoE, with 1M context + Vision - Substantially lower task cost at comparable intelligence - Broad software engineering capabilities with sustained execution over long horizons Try Step 5 Preview: https://t.co/fC7HHlWKFn Model page: https://t.co/4caJR2YGD3 Open weights on Oct 15.

StepFun

@StepFun_ai

Scale-up possibilities for everyone. API Platform: HuggingFace:

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StepFun@StepFun_ai

2026.09.20 03:15

Introducing Step 5 Preview: Advancing the Pareto Frontier. Step 5 Preview is our new flagship model for agentic work, delivering frontier-level performance across software engineering and professional knowledge work, with particular strength in finance. - 600B total / 27B active MoE, with 1M context + Vision - Substantially lower task cost at comparable intelligence - Broad software engineering capabilities with sustained execution over long horizons Try Step 5 Preview: Model page: Open weights on Oct 15.

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