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May 30
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.
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May 30
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
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/Step-3…
HuggingFace: huggingface.co/stepfun-ai/St…
GGUF: huggingface.co/stepfun-ai/St…
ModelScope: modelscope.cn/models/stepfun…
API: platform.stepfun.ai
Blog: static.stepfun.com/blog/step…
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Ailing Teng retweeted
May 20
Welcome, another 3.5 Flash 👋
May 19
Just off stage at #GoogleIO, some highlights from this morning 🧵
Gemini 3.5 Flash is available today for everyone in @antigravity and across our products and APIs.
Compared to 3.1 Pro, 3.5 Flash is better across almost all benchmarks with huge progress in coding. It’s also comparable to the best models but very fast (4x faster tokens/ second than other frontier models). And when looking at the intelligence versus output speed, it’s in a league of its own in the top right quadrant.
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Ailing Teng retweeted
May 12
10 days wasn't enough.
Step 3.5 Flash⚡ is back on @NousResearch Portal
free for the next 15 days!
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Ailing Teng retweeted
May 10
Google I/O week pulls the AI builder world into the Bay Area.
We're powering SEAMATE x Linkloud's Front Row meetup on May 16, a builder-only room of ~500 founders & devs working on agents, multimodal, and AI-native infra.
Our team is on the "Apps That Agents Actually Use" panel with Principle and Google.
Plug and Play, Sunnyvale. May 16, 3pm.
If you're in town, come say hi!
luma.com/ai-native-developer…
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May 8
StepFun’s first Silicon Valley event is happening during SaaStr Week.
No long panels. No formal stage. Just people building, sharing, and connecting.
Step out of the conference floor.
StepFun in.
RSVP: luma.com/4cqlswgf
May 7
Step Out. StepFun In. 🍕🍺
We’re hosting a Founder mixer during SaaStr week in San Mateo with SEAMATE!
AI founders, SaaS builders, operators, investors — open mic, dinner, open bar 'til 9.
May 12 · 5:30 PM PT
RSVP → luma.com/4cqlswgf
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Apr 22
Thanks
Apr 22
Step 3.5 Flash⚡ now live on @NousResearch Portal, free for 10 days!
Big thanks to the Nous team, it’s been awesome working with you.
Excited to see what the community ships🔥
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Apr 15
In Silicon Valley this May.
Mostly excited to talk models, agents, developer tools, product, and startups — especially the gap between model demos and products people actually use.
Founders, builders, researchers— say hi if you’re around the Bay Area.
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Ailing Teng retweeted
Mar 29
I have been sleeping on StepFun 3.5
WHAT A BEAST
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Ailing Teng retweeted
Mar 24
Quick update! Thanks to everyone using Step 3.5 Flash. The response has been amazing.
For those who want more: paid channels now get a dedicated fast lane at 100 tokens/s — that includes Step Plan and OpenRouter paid API.
Free tier speed stays as is. When you're ready to go faster, Step Plan starts at $6.99/mo.
platform.stepfun.ai/step-pla…
Mar 22
Step Plan is now live on StepFun Open Platform!!
Affordable OpenClaw and coding, all month.
What you get:
⚡ Step 3.5 Flash, fast inference on every tier.
🔧 Works with Cursor, Windsurf, Cline, and your own stack. Zero lock-in.
💰 Four tiers from $6.99/mo to $99/mo.
🔜 Multimodal flagship coming to the plan soon.
Check it out at: platform.stepfun.ai/step-pla…
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Ailing Teng retweeted
Mar 5
we're seeing more and more agents built on Step 3.5 Flash through @openclaw — and we love it.
to help you get started, here's our OpenClaw cookbook 👇
🔗 github.com/stepfun-ai/Step-3…
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Mar 4
Step 3.5 Flash is now open source: model weights and full training framework (SteptronOSS), released together.🚀
196B total, 11B active. SWE-bench Verified 74.4% / Terminal-Bench 2.0 51.0%.
- MoE architecture: 288 routed experts 1 shared, Top-8 activation per token
- MTP-3: predicts 4 tokens per forward pass, 100–300 tok/s typical, 350 tok/s peak
- 3:1 SWA ratio (1 full attention 3 sliding window layers): 256K context at lower compute cost
- 💻 Runs on Mac Studio M4 Max and NVIDIA DGX Spark
- SteptronOSS: SFT, continued pretraining, RL (WIP)
- Apache 2.0
Two checkpoints released: Step-3.5-Flash-Base and Step-3.5-Flash-Base-Midtrain.
🤖 Base: modelscope.cn/models/stepfun…
🤖 Midtrain: modelscope.cn/models/stepfun…
🔧 Training Framework: github.com/stepfun-ai/Steptr…
📄 Paper: modelscope.cn/papers/2602.10…
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Feb 19
Now
Feb 19
AMA is live! 🙌 Our team (including CEO, CTO & Chief Scientist) is answering your questions on r/LocalLLaMA today 8-11 AM PST. Jump in 👇
reddit.com/r/LocalLLaMA/comm…
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Feb 9
Thanks for the love.
Feb 9
You got Step 3.5 Flash trending on OpenRouter — even with tight limits. We noticed 👀
So we bumped it up 10x: 1K → 10K calls/day.
Thanks for the love 🙏
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Feb 2
Happy to be part of this launch.
I joined the team during this phase and worked on how this model should be understood, not just how it benchmarks.
Agents don’t fail because they think too much.
They fail because models aren’t fast or reliable enough to think in steps.
Feb 2
⚡️ Step 3.5 Flash is coming: Fast Enough to Think. Reliable Enough to Act！
We’re dropping our most capable open-source foundation model yet. Frontier reasoning meets extreme efficiency.
It leverages a sparse Mixture of Experts (MoE) architecture, 196B total → 11B active.
Key Capabilities:
✅Reasoning at Speed: MTP-3 powered throughput at 100–300 tok/s (350 tok/s peak for single-stream coding tasks).
✅Agentic Power: ⚡️ 74.4% SWE-bench Verified ⚡️ 51.0% Terminal-Bench 2.0. Proven stability for complex, long-horizon tasks.
✅256K Efficient Context: 3:1 SWA ratio Full Attention. Massive datasets or long codebases support with minimal overhead. Consistent performance, hybrid efficiency.
✅Local-First Deployment: Optimized for Mac Studio M4 Max, NVIDIA DGX Spark. Secure, private, and frontier-capable. Your data, your hardware, your agent.
You can try Step 3.5 Flash right now:
👉 OpenRouter: openrouter.ai/stepfun/step-3…
👉 GitHub: github.com/stepfun-ai/Step-3…
👉 HuggingFace：huggingface.co/stepfun-ai/St…
👉 Blog：static.stepfun.com/blog/step…
👉 ModelScope: modelscope.cn/models/stepfun…
🌌 The Next：Step 4 training is officially LIVE！
We're calling on the world's boldest builders to co-creat the Step 4 right now. Let's define the Agentic Era together!
Join our Discord：discord.gg/RcMJhNVAQc
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19 Jun 2023
Excited to attend the prestigious SIGMOD academic conference! Heading to the city for the event and looking forward to spending some time in beautiful Seattle. If anyone's interested, let's connect over a friendly coffee ☕️! #SIGMOD #Seattle #CoffeeChat 😄
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18 Jun 2023
Exciting times at the Bay Area Data Infrastructure Meetup! 🎉 Over 60 brilliant engineers came together today to discuss the latest trends and advancements. The enthusiasm was contagious, and everyone left with valuable insights and knowledge. #DataInfrastructure #TechCommunity
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14 May 2023
Thrilled to co-host an incredible gathering of 200 #AI enthusiasts with 出海同学会and @OceanBaseDB this Saturday. Witnessed a confluence of innovation, passion, and even future techies (babies included)! Thanks, all! Until next time. #TechForGood #FutureIsBright
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