StepFun Announces Financial Capability Evaluation of Step 5 Preview

On September 20, 2026, StepFun announced the financial capability evaluation of Step 5 Preview. Information released by the company the same day shows that Step 5 Preview is a flagship model designed for agentic work, employing a MoE architecture with 600B total parameters and 27B activated, supporting a 1M context and vision. The company states that it reaches frontier-level performance in software engineering and professional knowledge work, with particularly outstanding performance in the financial domain, and says it will open-source the weights on October 15. Another official piece of information from the same day noted that finance is a key focus area for the model; FinStepBench tests its ability to identify and verify reliable information, reconcile discrepancies in reports, clarify assumptions, and generate internally consistent forecasts and reproducible valuations across three areas—LiveSearch, CorporateValuation, and DeepResearch—and also evaluated it on six investment use cases in FrontierFinance. There are currently no further developments.

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1. Sep 20· 5 reports

   StepFun Announces Step 5 Preview Financial Capability Evaluation

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