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StepFun Brings Step 5 Preview to Tencent WorkBuddy for a Two-Week Free Trial
StepFun announced Step 5 Preview on Tencent WorkBuddy with free access from October 12 through October 25, 2026. Step 5 Preview is a 600 billion parameter sparse MoE model with about 27 billion parameters active per token and a 1 million token context window.
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Key takeaways
- StepFun announced Step 5 Preview on Tencent WorkBuddy with free access from October 12 through October 25, 2026.
- Step 5 Preview is a 600 billion parameter sparse MoE model with about 27 billion parameters active per token and a 1 million token context window.
- The model’s weights were released on October 15, during the WorkBuddy promotion, creating a separate download route for developers.
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openai.comCreate a landscape editorial hero image for this Studio Global article: What did StepFun announce on October 12, 2026, about bringing its flagship Step 5 Preview model to Tencent’s AI-native WorkBuddy office agen. Article summary: On October 12, 2026, StepFun announced that its flagship Step 5 Preview model was available in Tencent’s AI-native WorkBuddy office agent, with an exclusive free-use promotion running October 12–25. The announcement esta. Topic tags: general, general web, user generated. Style: premium digital editorial illustration, source-backed research mood, clean composition, high detail, modern web publication hero. Use reference image context only for broad subject, composition, and topical grounding; do not copy the exact image. Avoid: logos, brand marks, copyrighted characters, real person likenesses, fake screenshots, UI text, readable text, watermarks, charts with fa
StepFun announced on October 12, 2026, that its flagship Step 5 Preview model was available in Tencent’s WorkBuddy office agent, with exclusive free access through October 25. The announcement established a limited promotion—not permanent free use or guaranteed continued availability. 51
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What the WorkBuddy integration means
The integration makes Step 5 Preview available inside WorkBuddy, rather than only through a developer-facing API. WorkBuddy includes office-oriented features such as Office AI editing and scheduled tasks, but the announcement does not specify which of those workflows support Step 5 Preview. 47
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WorkBuddy also has a mobile app. However, the available reporting does not confirm that Step 5 Preview was selectable on every mobile client during the promotion. 18
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Free access ended October 25; future terms were not stated
StepFun described the October 12–25 period as exclusive free access on WorkBuddy. It did not announce a post-promotion price or confirm that Step 5 Preview would remain a permanent WorkBuddy option. 51
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That distinction matters: the promotion confirms when users could try the model in WorkBuddy, but it does not establish WorkBuddy’s later commercial terms. StepFun’s separate API pricing, where available, would not by itself determine the price of access through WorkBuddy.
Step 5 Preview: launch and capabilities
StepFun introduced Step 5 Preview on September 20 as a flagship model for agentic work, including software engineering and professional knowledge work, with particular emphasis on finance. The company describes it as a sparse mixture-of-experts (MoE) model with 600 billion total parameters and about 27 billion active per token. It supports a 1-million-token context window; StepFun’s documentation lists text, image and video input. 12
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Those are model specifications, not proof that every capability is available through the WorkBuddy integration. The October 12 announcement confirms availability in WorkBuddy but does not provide a detailed feature-by-feature account of how the model handles documents, spreadsheets or other tasks there. 51
The hosted trial and the released weights are different routes
StepFun released Step 5 Preview’s weights on October 15, within the WorkBuddy free-access window. The release gave developers a separate route to download the model, while the WorkBuddy integration offered access through an office-agent product. 9
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Downloading model weights is not the same as using the hosted WorkBuddy integration: it does not, on its own, establish that running the model is free, or clarify WorkBuddy’s pricing after October 25. The practical takeaway is straightforward: the announcement opened a temporary in-product trial, while the model’s longer-term availability and WorkBuddy terms remained unspecified. 9
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What is the short answer to "StepFun Brings Step 5 Preview to Tencent WorkBuddy for a Two-Week Free Trial"?
StepFun announced Step 5 Preview on Tencent WorkBuddy with free access from October 12 through October 25, 2026.
What are the key points to validate first?
StepFun announced Step 5 Preview on Tencent WorkBuddy with free access from October 12 through October 25, 2026. Step 5 Preview is a 600 billion parameter sparse MoE model with about 27 billion parameters active per token and a 1 million token context window.
What should I do next in practice?
The model’s weights were released on October 15, during the WorkBuddy promotion, creating a separate download route for developers.
Sources
ithome.com阶跃Step 5 Preview 模型上线腾讯WorkBuddy，10 月12 至 ...
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workbuddy.aiChangelog | WorkBuddy - AI Agent for Everyday Office Work
pandaily.comTencent WorkBuddy APP Launches on HarmonyOS, iOS, and Android Simultaneously: Cross-Platform AI Work Agent Goes Mobile
stepfun.comStep 5 Preview: Advancing the Pareto Frontier - stepfun.com