Step Step 5 Preview Model Launched on Tencent WorkBuddy, Exclusive Free Trial from October 12th to 25th
Ai Focus
Step StepFun announces that the Step 5 Preview model has been launched on Tencent WorkBuddy, and an exclusive limited-time discount is available from October 12 to October 25, 2026, at WorkBuddy. This model is designed for scenarios such as AI programming, software engineering, professional knowledge work, and finance. It adopts a sparse MoE architecture and supports up to 1 million Token context windows.
News from the IT Home on October 12th: Step StepFun announced today that the Step 5 Preview model has been launched on Tencent WorkBuddy. From October 12th to October 25th, 2026, an exclusive limited-time discount will be available at WorkBuddy.

As previously reported by IT, on September 20th, Stepwise launched its flagship model Step 5 Preview targeting scenarios such as AI programming, software engineering, professional knowledge work, and finance, aiming to enhance the model's performance in executing real-world Agentic tasks. On October 15th, the complete weights of the model were made open-source.

This model adopts a sparse MoE hybrid expert architecture, with a total of 600B parameters and 27B activation parameters. It supports up to 1 million Token context windows and natively handles both text and visual inputs.
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