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Ailing Teng

Verified account StepFun

@EileenTal

GM, Model Product, Platform and Ecosystem @StepFun
San Jose, CA Joined May 2013
622 Following 293 Followers 233 Posts

Latest posts 5

Ailing Teng Verified account @EileenTal
Great models deserve to be in developers' hands.
Step 5 Preview is now available across more platforms, with free access rolling out.
Build something interesting. Surprise us.
StepFun @StepFun_ai Oct 8
Step 5 Preview now exists where you build.

Now live on @OpenRouter. A week of free access is rolling out today across @opencode, @cline , @NousResearch, @kilocode, and more.

Flagship-tier intelligence for agentic and professional work, at substantially lower task cost.

Keep your workflow. Switch your model.

Try Step 5 Preview on OpenRouter: openrouter.ai/stepfun/step-5…
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Ailing Teng Verified account @EileenTal
Introducing our project
StepFun @StepFun_ai Sep 20
Introducing Step 5 Preview: Advancing the Pareto Frontier.

Step 5 Preview is our new flagship model for agentic work, delivering frontier-level performance across software engineering and professional knowledge work, with particular strength in finance.

- 600B total / 27B active MoE, with 1M context + Vision
- Substantially lower task cost at comparable intelligence
- Broad software engineering capabilities with sustained execution over long horizons

Try Step 5 Preview: platform.stepfun.ai
Model page: stepfun.com/step-5-preview

Open weights on Oct 15.
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Ailing Teng Verified account @EileenTal
Great panel today at BEYOND ClawCon Macao on Building AI Agents for the Real World.
My biggest takeaway: agents are moving from demos to production, and the hard part is no longer just capability — it’s reliable execution.
Ailing Teng Verified account @EileenTal
Today at BEYOND ClawCon Macao, I shared our view on the next phase of model competition:The new frontier is agent efficiency.
Not just intelligence.But the ability to get real-world agentic work done — reliably, efficiently, and at scale.
That’s the thinking behind Step 3.7 Flash
StepFun @StepFun_ai May 29
⚡️ Step 3.7 Flash is here: The new frontier is agent efficiency.

#1 ClawEval-1.1 (67.1), #1 SimpleVQA Search (79.2), #2 SWE-PRO (56.3), 95.3 on V* Python. Open weights under Apache 2.0.

Built for agentic, coding, search, and multimodal workflows — balancing speed, cost, and reliable execution.

- 400 TPS. 198B sparse MoE, ~11B active. 256K context, 3 reasoning levels.
- Understands UIs, charts, docs, images — then writes code or calls tools to act on what it sees.
- Web + visual search reaches further: more sources, deeper follow-up.
- Reliable tool use — less drift, fewer broken toolcalls. 98%+ on τ²-bench across all difficulty levels.
- Works with Claude Code, KiloCode, Hermes Agent, OpenClaw, and protocols like MCP.
- Runs locally on Mac Studio M4 Max, DGX Spark, AMD AI Max+ 395.

GitHub: github.com/stepfun-ai/Ste…
HuggingFace: huggingface.co/stepfun-ai/Ste…
GGUF: huggingface.co/stepfun-ai/Ste…
ModelScope: modelscope.cn/models/stepfun…
API: platform.stepfun.ai
Blog: static.stepfun.com/blog/step-3.7-…
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