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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 Mercury Voice?

Mercury embodies a cutting-edge collection of diffusion large language models meticulously crafted to deliver exceptional LLM performance at impressive speeds, capable of processing over 1,000 tokens per second on commercial NVIDIA GPUs for instant AI applications. Engineered for compatibility with OpenAI, these models aim to effortlessly supplant conventional LLMs, making integration into existing AI systems simpler than ever. Notably, Mercury 2.5 emerges as the most advanced reasoning diffusion LLM, specifically designed for complex tasks where high performance and quality are of utmost importance. It features an extensive 260K context window, which facilitates sophisticated reasoning, the use of tools, and organized output, proving useful in a range of applications from rapid coding cycles to the creation of agents, customer support systems, and enterprise-level search capabilities. Furthermore, Mercury Voice is expertly optimized for voice agents, achieving an impressive time-to-first-token of under 170 ms while also supporting reasoning, tool usage, structured outputs, and a 128K context window. This makes it exceptionally adaptable for numerous applications, such as customer support, healthcare assistance, educational platforms, and interactive gaming experiences. In essence, the Mercury family is dedicated to expanding the frontiers of what AI can achieve in real-time scenarios, continuously striving for innovation and excellence. As they push the limits of technology, they open new avenues for enhancing user experiences across diverse sectors.

Media

Media

Integrations Supported

GitHub
Hugging Face
ModelScope
arXiv

Integrations Supported

Claude Haiku 4.5
GPT-5.6 Luna
Gemini 3.5 Flash-Lite
OpenAI

API Availability

Has API

API Availability

Has API

Pricing Information

Free
Free Version

Pricing Information

$0.04 per 1M tokens
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub
Online 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

Inception

Company Location

United States

Company Website

www.inceptionlabs.ai/models

Categories and Features

AI Models

Not specified

Foundation Models

Not specified

Categories and Features

AI Models

Not specified

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