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What is Step 3.5 Flash?

Step 3.5 Flash represents a state-of-the-art open-source foundational language model crafted for sophisticated reasoning and agent-like functionality, prioritizing efficiency; it employs a sparse Mixture of Experts (MoE) framework that activates roughly 11 billion of its nearly 196 billion parameters for each token, which ensures both dense intelligence and rapid responsiveness. The architecture includes a 3-way Multi-Token Prediction (MTP-3) system, enabling the generation of hundreds of tokens per second and supporting intricate multi-step reasoning and task execution, while efficiently handling extensive contexts through a hybrid sliding window attention technique that reduces computational stress on large datasets or codebases. Its remarkable capabilities in reasoning, coding, and agentic tasks often rival or exceed those of much larger proprietary models, further enhanced by a scalable reinforcement learning mechanism that promotes ongoing self-improvement. This innovative design not only highlights Step 3.5 Flash's effectiveness but also positions it as a transformative force in the domain of AI language models, indicating its vast potential across a plethora of applications. As such, it stands as a testament to the advancements in AI technology, paving the way for future developments.

What is AfterQuery?

AfterQuery functions as an innovative research platform designed to create high-quality training datasets for advanced artificial intelligence models by mimicking the thought processes of experienced professionals as they analyze, reason, and solve problems within their areas of expertise. By transforming real-world work situations into structured datasets, it offers insights that go beyond simple outputs, integrating complex decision-making, trade-offs, and contextual reasoning that typical data from the internet often overlooks. The platform engages closely with subject matter experts to generate supervised fine-tuning data, which encompasses prompt-response pairs alongside thorough reasoning paths, as well as reinforcement learning datasets that feature meticulously crafted prompts and evaluation frameworks translating subjective assessments into scalable rewards. Additionally, it constructs tailored agent environments using a variety of APIs and tools, which support the training and assessment of models within realistic workflows while meticulously tracking computer usage patterns that reveal how users interact with software in a detailed, sequential manner. This comprehensive methodology guarantees that the produced data not only embodies expert insights but is also versatile for numerous applications in the constantly evolving field of artificial intelligence, ultimately fostering better model performance and understanding. By bridging the gap between expert knowledge and AI training, AfterQuery positions itself as a pivotal player in the development of smarter, more capable AI systems.

Media

Media

Integrations Supported

GitHub
Hugging Face
Model Context Protocol (MCP)
ModelScope
arXiv

Integrations Supported

GitHub
Hugging Face
Model Context Protocol (MCP)
ModelScope
arXiv

API Availability

Has API

API Availability

Has API

Pricing Information

Free
Free Trial Offered?
Free Version

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

StepFun

Date Founded

2023

Company Location

China

Company Website

static.stepfun.com/blog/step-3.5-flash/

Company Facts

Organization Name

AfterQuery

Date Founded

2025

Company Location

United States

Company Website

www.afterquery.com

Categories and Features

Categories and Features

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