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About

Grok 4.1 Fast is the newest xAI model designed to deliver advanced tool-calling capabilities with a massive 2-million-token context window. It excels at complex real-world tasks such as customer support, finance, troubleshooting, and dynamic agent workflows. The model pairs seamlessly with the new Agent Tools API, which enables real-time web search, X search, file retrieval, and secure code execution. This combination gives developers the power to build fully autonomous, production-grade agents that plan, reason, and use tools effectively. Grok 4.1 Fast is trained with long-horizon reinforcement learning, ensuring stable multi-turn accuracy even across extremely long prompts. With its speed, cost-efficiency, and high benchmark scores, it sets a new standard for scalable enterprise-grade AI agents.

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.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

This content is ideal for developers, enterprises, and technical teams seeking to build advanced AI agents that require real-time data access, long-context reasoning, and reliable tool-calling capabilities

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

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

No information available.
Free Version
Free Trial

Pricing

Free
Free Version
Free Trial

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
design 5.0 / 5
support 5.0 / 5

Reviews/Ratings

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

This software hasn't been reviewed yet. Be the first to provide a review:

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Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

xAI
Founded: 2023
United States
grok.com

Company Information

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

Alternatives

Alternatives

MiMo-V2-Flash

MiMo-V2-Flash

Xiaomi Technology
GLM-4.5

GLM-4.5

Z.ai
MiniMax M2.5

MiniMax M2.5

MiniMax
MiniMax-M2.1

MiniMax-M2.1

MiniMax
DeepSeek-V2

DeepSeek-V2

DeepSeek
GLM-5

GLM-5

Zhipu AI

Categories

Categories

Integrations

C
C#
Cursor
Doraverse
Elixir
F#
GitHub
Go
Grok Imagine
Hugging Face
JavaScript
Julia
LaunchLemonade
Microsoft Foundry Models
ModelScope
OpenRouter
Scala
SuperGrok
arXiv
iMini

Integrations

C
C#
Cursor
Doraverse
Elixir
F#
GitHub
Go
Grok Imagine
Hugging Face
JavaScript
Julia
LaunchLemonade
Microsoft Foundry Models
ModelScope
OpenRouter
Scala
SuperGrok
arXiv
iMini
Claim Grok 4.1 Fast and update features and information
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Claim Step 3.5 Flash and update features and information