Step 3.5 FlashStepFun
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About
Merrymake is a European AI think tank and dedicated research lab based in Aarhus, Denmark. We are actively working to accelerate a safe and sovereign transition to Artificial Superintelligence (ASI). Our core mission is to ensure that superhuman intelligence benefits all of life, humanity, and every individual.
We believe that achieving ASI is the most profound technological leap of our time. At Merrymake, we are not just building this intelligence; we are engineering a safe bridge to get there. Rooted in European values of transparency, collaboration, and public benefit, we approach the transition with rigorous care. We actively focus on stabilizing the job market, evolving education, and partnering with governments to guarantee strict privacy and public safety.
Operating at the technical frontier, our team approaches both AI capability and alignment as unified, solvable engineering challenges. Our research spans the full stack of frontier AI development.
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About
Step 3.5 Flash is an advanced open source foundation language model engineered for frontier reasoning and agentic capabilities with exceptional efficiency, built on a sparse Mixture of Experts (MoE) architecture that selectively activates only about 11 billion of its ~196 billion parameters per token to deliver high-density intelligence and real-time responsiveness. Its 3-way Multi-Token Prediction (MTP-3) enables generation throughput in the hundreds of tokens per second for complex multi-step reasoning chains and task execution, and it supports efficient long contexts with a hybrid sliding window attention approach that reduces computational overhead across large datasets or codebases. It demonstrates robust performance on benchmarks for reasoning, coding, and agentic tasks, rivaling or exceeding many larger proprietary models, and includes a scalable reinforcement learning framework for consistent self-improvement.
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Audience
Enterprise; mid-sized; small; startup; freelance; government; non-profit; anyone that develops software
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Audience
Developers, researchers, and AI engineers who want a powerful open source foundational AI model capable of fast, deep reasoning, coding assistance, and agentic task execution
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Support
Phone Support
24/7 Live Support
Online
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Support
Phone Support
24/7 Live Support
Online
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API
Offers API
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API
Offers API
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Screenshots and VideosNo images available
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Pricing
No information available.
Free Version
Free Trial
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Pricing
Free
Free Version
Free Trial
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Reviews/
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Reviews/
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Training
Documentation
Webinars
Live Online
In Person
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Training
Documentation
Webinars
Live Online
In Person
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Company InformationMerrymake
Founded: 2021
Denmark
merrymake.eu
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Company InformationStepFun
Founded: 2023
China
static.stepfun.com/blog/step-3.5-flash/
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Integrations
GitHub
Hugging Face
ModelScope
arXiv
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