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

About Step 3.5 Flash

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.

Pricing

Starting Price:
Free
Free Version:
Free Version available.

Integrations

API:
Yes, Step 3.5 Flash offers API access

Ratings/Reviews

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

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Company Information

StepFun
Founded: 2023
China
static.stepfun.com/blog/step-3.5-flash/

Videos and Screen Captures

Step 3.5 Flash Screenshot 1
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Product Details

Platforms Supported
Cloud
iPhone
iPad
Android
Training
Documentation
Support
Online

Step 3.5 Flash Frequently Asked Questions

Q: What kinds of users and organization types does Step 3.5 Flash work with?
Q: What languages does Step 3.5 Flash support in their product?
Q: What kind of support options does Step 3.5 Flash offer?
Q: What other applications or services does Step 3.5 Flash integrate with?
Q: Does Step 3.5 Flash have an API?
Q: Does Step 3.5 Flash have a mobile app?
Q: What type of training does Step 3.5 Flash provide?
Q: How much does Step 3.5 Flash cost?

Step 3.5 Flash Product Features

Step 3.5 Flash Additional Categories