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Description

Grok 4.5 is xAI’s smartest model for software development, agentic workflows, technical problem solving, and business productivity. It is built to handle demanding coding tasks, engineering challenges, multi-step reasoning, and knowledge work that requires accuracy, speed, and strong execution. The model was trained on high-signal datasets spanning coding, science, engineering, and mathematics, with reinforcement learning designed around long-running technical and agentic tasks. Grok 4.5 can generate full applications from a single prompt, work through complex Rust, C, C++, and software engineering problems, and assist with real-world development projects. It is also designed for office productivity, including building Excel models, creating PowerPoint diagrams and slide content, and writing clear documents in Word. The model emphasizes efficient reasoning, producing strong results while using fewer output tokens than some comparable leading models. Grok 4.5 is served at fast-model speeds and is priced for scalable API usage, making it practical for production development and automation. Users can access it through Grok Build, Cursor, and the xAI API console, with API integration available through standard developer workflows. Grok 4.5 is especially useful for teams that need a model capable of coding, planning, analyzing, building, and completing complex digital tasks from natural language instructions.

Description

Step 3.5 Flash is a cutting-edge open-source foundational language model designed for advanced reasoning and agent-like capabilities, optimized for efficiency; it utilizes a sparse Mixture of Experts (MoE) architecture that activates only approximately 11 billion of its nearly 196 billion parameters per token, ensuring high-density intelligence and quick responsiveness. The model features a 3-way Multi-Token Prediction (MTP-3) mechanism that allows it to generate hundreds of tokens per second, facilitating complex multi-step reasoning and task execution while efficiently managing long contexts through a hybrid sliding window attention method that minimizes computational demands across extensive datasets or codebases. Its performance on reasoning, coding, and agentic tasks is formidable, often matching or surpassing that of much larger proprietary models, and it incorporates a scalable reinforcement learning system that enables continuous self-enhancement. Moreover, this innovative approach positions Step 3.5 Flash as a significant player in the field of AI language models, showcasing its potential to revolutionize various applications.

API Access

Has API

API Access

Has API

Screenshots View All

Screenshots View All

Integrations

Convex
Cursor
GitHub
Grok
Grok Build
Hermes Agent
Hugging Face
ModelScope
OpenClaw
SuperGrok
arXiv

Integrations

Convex
Cursor
GitHub
Grok
Grok Build
Hermes Agent
Hugging Face
ModelScope
OpenClaw
SuperGrok
arXiv

Pricing Details

$2 per million input tokens
Free Trial
Free Version

Pricing Details

Free
Free Trial
Free Version

Deployment

Web-Based
On-Premises
iPhone App
iPad App
Android App
Windows
Mac
Linux
Chromebook

Deployment

Web-Based
On-Premises
iPhone App
iPad App
Android App
Windows
Mac
Linux
Chromebook

Customer Support

Business Hours
Live Rep (24/7)
Online Support

Customer Support

Business Hours
Live Rep (24/7)
Online Support

Types of Training

Training Docs
Webinars
Live Training (Online)
In Person

Types of Training

Training Docs
Webinars
Live Training (Online)
In Person

Vendor Details

Company Name

xAI

Founded

2023

Country

United States

Website

grok.com

Vendor Details

Company Name

StepFun

Founded

2023

Country

China

Website

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

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