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What is fx?

fx is a compact, open-source coding agent and command-line interface (CLI) crafted in Zig, tailored for research purposes, performance enhancement, and smooth integration into larger frameworks. Its design philosophy highlights minimalism across the system prompt, available functionalities, memory efficiency, and achieves a compact binary size of just 6 MB, striving for a user experience reminiscent of a Unix shell instead of a bulky terminal IDE. With an outstanding cold start time measured in microseconds, fx efficiently bypasses unnecessary tasks or I/O actions prior to command receipt, making it particularly well-suited for programmatic environments, resource-constrained settings, and agent sandboxes. Developers can effortlessly launch it within any project to execute a variety of functions including file reading, code searching, command execution, change implementation, test running, and real-time tool activation streaming. Its underlying architecture is model- and provider-agnostic, allowing for compatibility with local models, API gateways, direct provider connections, and cloud-based inference options. By prioritizing context efficiency, it employs a concise system prompt and a streamlined toolset to reduce token overhead and improve the speed of generating the first response token. Furthermore, this focused approach on lightweight operations and rapid interactions empowers developers to sustain their productivity without the common burdens associated with more intricate environments. In essence, fx represents a significant advancement in efficient coding tools, catering to the needs of modern developers while ensuring a straightforward operational flow.

What is Grok Code Fast 1?

Grok Code Fast 1 is the latest model in the Grok family, engineered to deliver fast, economical, and developer-friendly performance for agentic coding. Recognizing the inefficiencies of slower reasoning models, the team at xAI built it from the ground up with a fresh architecture and a dataset tailored to software engineering. Its training corpus combines programming-heavy pre-training with real-world code reviews and pull requests, ensuring strong alignment with actual developer workflows. The model demonstrates versatility across the development stack, excelling at TypeScript, Python, Java, Rust, C++, and Go. In performance tests, it consistently outpaces competitors with up to 190 tokens per second, backed by caching optimizations that achieve over 90% hit rates. Integration with launch partners like GitHub Copilot, Cursor, Cline, and Roo Code makes it instantly accessible for everyday coding tasks. Grok Code Fast 1 supports everything from building new applications to answering complex codebase questions, automating repetitive edits, and resolving bugs in record time. The cost structure is intentionally designed to maximize accessibility, at just $0.20 per million input tokens and $1.50 per million outputs. Real-world human evaluations complement benchmark scores, confirming that the model performs reliably in day-to-day software engineering. For developers, teams, and platforms, Grok Code Fast 1 offers a future-ready solution that blends speed, affordability, and practical coding intelligence.

Media

Media

Integrations Supported

Integrations Supported

C
C#
C++
Cursor
Dessix
Devin Desktop
GitHub Copilot
Go
Grok
Grok Build
Java
JavaScript
Kilo Code
Microsoft Foundry Models
OpenCode
PHP
Rust
Shiori
TypeScript
Visual Studio Code

API Availability

API Availability

Has API

Pricing Information

Free
Free Version

Pricing Information

$0.20 per million input tokens
$0.20 per million input tokens
$1.50 per million output tokens
$0.02 per million cached tokens
Free Version
Free Trial Offered?

Supported Platforms

SaaS

Supported Platforms

SaaS
Windows
Mac
Linux

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

Vercel

Date Founded

2015

Company Location

United States

Company Website

fx.sh/

Company Facts

Organization Name

SpaceXAI

Date Founded

2023

Company Location

United States

Company Website

x.ai

Categories and Features

AI Coding Agents

Not specified

Categories and Features

Agentic AI

Not specified

AI Coding Agents

Not specified

AI Coding Models

Not specified

AI Models

Not specified

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