Step 3.5 FlashStepFun
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Related Products
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About
Arcee AI is a US-based open intelligence lab focused on building high-performance, open-weight AI models for developers and enterprises. It develops frontier AI systems designed for reasoning, scalability, and real-world applications. The company is known for its Trinity model family, which delivers advanced capabilities while remaining transparent and accessible. Arcee AI emphasizes continuous improvement through techniques like online reinforcement learning, allowing models to evolve after deployment. Its approach prioritizes cost efficiency, enabling powerful AI performance without excessive infrastructure costs. The platform supports developers with tools, APIs, and open-source resources to build intelligent applications. Overall, Arcee AI aims to make cutting-edge AI more accessible, practical, and scalable for a wide range of use cases.
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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
AI developers, enterprises, and research teams seeking scalable, open-weight AI models and tools for building advanced, cost-efficient intelligent applications
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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 Videos |
Screenshots and Videos |
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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 InformationArcee AI
Founded: 2023
United States
www.arcee.ai/
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Company InformationStepFun
Founded: 2023
China
static.stepfun.com/blog/step-3.5-flash/
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