StepFun introduces Step 5 Preview, with open weights planned for October 15, 2026
StepFun says its new flagship model has 600 billion total parameters, 27 billion active parameters, a 1M context window and vision support. It emphasizes software engineering and professional knowledge work, claiming particular strength in finance.
TLDR
StepFun announced Step 5 Preview on September 20, describing it as a model for AI agent work. The company claims substantially lower task costs at comparable intelligence, broad software-engineering capabilities and sustained execution over long-running tasks. TestingCatalog reports that the preview is available in StepFun AI Studio and via APIs. StepFun plans to release open weights on October 15, 2026.
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