WorkBuddy makes StepFun Step 5 Preview free until October 25 in both its China and international apps
Tencent's WorkBuddy has added StepFun's flagship Step 5 Preview to its model list with an exclusive free window from October 12 to October 25. The model normally uses credits at a 0.43x rate; during the promotion the rate drops to 0, and the context window can be raised to 1M tokens.
The briefing
Tencent's WorkBuddy has partnered with StepFun to bring Step 5 Preview into the app, free for two weeks. The model shows up in both the international and China versions of WorkBuddy, so this is a good window to try it for coding, document work, or data analysis.
What you can use
The free window runs from October 12 to October 25. Step 5 Preview normally consumes credits at 0.43x; during the promotion the rate is 0, so chats with it do not use your credits.
You can adjust reasoning effort in the model settings. The context window defaults to 300K tokens and can be raised to 1M tokens for long documents or large codebases.
Specs and public benchmarks
Step 5 Preview is StepFun's flagship model for agentic work. It uses a sparse mixture-of-experts architecture with 600B total parameters and 27B active per token, accepts text, image, and video input, and supports tool calling and structured output. It targets software engineering and professional knowledge work.
In StepFun's published results, Step 5 Preview scores 67.7 on DeepSWE v1.1, 80.5 on ProgramBench, and 66.4 on FrontierFinance, ahead of Kimi K3 and GLM-5.3 on all three. It scores 44 on the Artificial Analysis Intelligence Index.
More detail: StepFun Step 5 Preview.
How to use it
- Open the WorkBuddy app and sign in (international or China version).
- Pick Step-5-Preview in the model list, then set reasoning effort and context window as needed.
Download WorkBuddy: international version or China version.